CN113707569A

CN113707569A - Display panel detection method and display panel

Info

Publication number: CN113707569A
Application number: CN202110979317.4A
Authority: CN
Inventors: 钟晨; 赖勐; 杨金金; 袁永
Original assignee: Xiamen Tianma Display Technology Co Ltd
Current assignee: Xiamen Tianma Display Technology Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2021-11-26
Anticipated expiration: 2041-08-25
Also published as: CN113707569B

Abstract

The invention discloses a detection method of a display panel and the display panel, belonging to the technical field of display.A display panel to be detected comprises a plurality of pixel driving circuits and a plurality of light-emitting elements, wherein m pixel driving circuits are arranged in a pixel driving circuit row group, and n pixel driving circuits are arranged in a pixel driving circuit column group; the detection method comprises the steps of sequentially lightening the light-emitting element corresponding to each pixel driving circuit row group and monitoring a first light-emitting current; sequentially lightening the light-emitting element corresponding to each pixel driving circuit column group, and monitoring a second light-emitting current; and judging whether the display dead pixel exists in the light-emitting element in the display panel or not by comparing each first light-emitting current with each second light-emitting current. The display panel adopts the detection method to detect the display dead pixel. The invention can improve the detection efficiency and the detection precision on the premise of not adding expensive detection equipment.

Description

Display panel detection method and display panel

Technical Field

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

Background

With the development of technology, various Display panels have been developed, such as a Liquid Crystal Display (LCD) panel, an Organic Light-Emitting Diode (OLED) panel, or a Light-Emitting Diode (led) panel. The organic light emitting diode display panel and the light emitting diode display panel are self-luminous technologies, so that the application of a backlight device is omitted, the ultrathin trend of the display panel is facilitated, and the organic light emitting diode display panel and the light emitting diode display panel have the advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, high reaction speed and the like, have better excellent reliability and longer service life, and are regarded as the mainstream of the display technology.

However, in the manufacturing stage of the oled display panel, due to the process yield, some display pixels may not emit light or the light emitting performance is not as expected, so that a Dead Pixel (Dead Pixel) is formed, which affects the display quality of the display panel, and the increase of the screen size will greatly increase the detection time and the detection accuracy of the operator.

In the prior art, a camera principle is generally adopted for detection, a display panel to be detected and a high-precision camera are fixed on a platform, luminance data of the display panel is collected through the camera for analysis, the approximate position of a dead pixel is obtained, and then manual detailed reinspection is carried out. Because the resolution of a camera CCD (Charge-coupled Device, also called a CCD image sensor) is fixed, but the size and resolution of the display panel to be detected are different, the actual detection of dead pixels will be significantly affected by the factors such as the imaging position and angle, the placement and assembly accuracy of the display panel to be detected, and the like, and manual retesting is still required when the detection accuracy is not high. The detection mode that above-mentioned scheme adopted exists that the detection precision is lower, needs artifical retest, and need add high accuracy equipment, especially when measuring the display panel of great size, the problem that the detection precision descends easily.

Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a method for detecting a display panel and a display panel, which can improve detection efficiency and detection accuracy without adding expensive detection equipment.

Disclosure of Invention

In view of the above, the present invention provides a detection method for a display panel and a display panel, so as to solve the problems that the detection method in the prior art has low detection accuracy, requires manual retesting, requires high-precision equipment, and is easy to decrease the detection accuracy particularly when measuring a display panel with a large size.

The invention discloses a detection method of a display panel, wherein the detected display panel comprises the following steps: the display panel also comprises a plurality of light-emitting elements, and the light-emitting elements correspond to and are electrically connected with the pixel driving circuit; the pixel driving circuit array comprises a plurality of pixel driving circuits which are sequentially arranged along a first direction to form a pixel driving circuit row, a plurality of pixel driving circuit rows which are sequentially arranged along a second direction to form a pixel driving circuit column, and a plurality of pixel driving circuit columns which are sequentially arranged along the second direction to form a pixel driving circuit column, wherein the pixel driving circuit columns are sequentially arranged along the first direction, and the first direction and the second direction are intersected; m pixel driving circuit rows are one pixel driving circuit row group, and n pixel driving circuit rows are one pixel driving circuit column group; wherein m and n are positive integers; the detection method comprises the following steps: sequentially lightening the light-emitting element corresponding to each pixel driving circuit row group, and monitoring the first light-emitting current of the light-emitting element of each pixel driving circuit row group; sequentially lighting the light-emitting element corresponding to each pixel driving circuit column group, and monitoring a second light-emitting current of the light-emitting element of each pixel driving circuit column group; and judging whether the display dead pixel exists in the light-emitting element in the display panel or not by comparing each first light-emitting current with each second light-emitting current.

Based on the same invention concept, the invention also discloses a display panel, and the display panel adopts the detection method to detect the display dead pixel; the display panel comprises a display area and a non-display area arranged around the display area, wherein the non-display area comprises a binding area; the monitoring end of the luminous current of the luminous element is positioned in the binding area.

Compared with the prior art, the detection method of the display panel and the display panel provided by the invention at least realize the following beneficial effects:

the display panel to be detected is normally lightened by adopting an array scanning lightening mode, the first lightening current of the lightening element during the working period of each pixel driving circuit row group is monitored by current detection equipment, and when one or more first lightening currents are abnormal, the pixel driving circuit row group or the pixel driving circuit row groups are confirmed to have display dead spots; observing the current of the row group of the pixel driving circuit with the display dead pixel, lightening the light-emitting elements of different pixel driving circuit column groups, monitoring the second light-emitting current of the light-emitting elements during the working period of each pixel driving circuit column group through current detection equipment, confirming that the pixel driving circuit column group or the pixel driving circuit column groups have the display dead pixel when the second light-emitting current is abnormal, and combining the two to obtain the area coordinate which takes the row group and the column group as the unit and is used for displaying the dead pixel. According to the detection method, the detection efficiency is greatly improved by the mode of scanning and lighting the light-emitting elements on the display panel to be detected, and whether the display panel has display dead pixels or not is judged quickly on the premise of not adding expensive detection equipment, so that the detection efficiency is high, and the detection precision is favorably improved.

Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, 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 plan view of a display panel to be detected according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a detection method provided by an embodiment of the invention;

FIG. 3 is a block flow diagram of a detection method provided by an embodiment of the invention;

fig. 4 is a schematic diagram of a first luminescence current of each pixel driving circuit row group detected by the detection method according to the embodiment of the present invention;

fig. 5 is a schematic diagram of a second light-emitting current of each pixel driving circuit column group detected by the detection method provided by the embodiment of the invention;

fig. 6 is a circuit diagram of a pixel driving circuit connected to a light emitting device according to an embodiment of the invention;

FIG. 7 is another block flow diagram of a detection method provided by embodiments of the present invention;

fig. 8 is a schematic plan view of another display panel to be tested according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of another detection method provided by embodiments of the present invention;

FIG. 10 is another block flow diagram of a detection method provided by embodiments of the present invention;

fig. 11 is another schematic diagram of the first luminescence current of each pixel driving circuit row group detected by the detection method according to the embodiment of the invention;

fig. 12 is another schematic diagram of the second light emitting current of each pixel driving circuit column group detected by the detection method according to the embodiment of the invention;

fig. 13 is another schematic diagram of the first luminescence current of each pixel driving circuit row group detected by the detection method according to the embodiment of the invention;

fig. 14 is another schematic diagram of the second light-emitting current of each pixel driving circuit column group detected by the detection method according to the embodiment of the invention;

FIG. 15 is an enlarged view of a portion of the area of defective pixel 1 of FIG. 2;

FIG. 16 is another block flow diagram of a detection method provided by embodiments of the present invention;

FIG. 17 is a schematic diagram of the first sub-emission current of each pixel driving circuit row in the area where the display dead pixel 1 is detected by the detection method according to the embodiment of the present invention;

FIG. 18 is a diagram illustrating the second sub-emission current of each pixel driving circuit row in the area where the display dead pixel 1 is detected by the detection method according to the embodiment of the present invention;

FIG. 19 is another block flow diagram of a detection method provided by embodiments of the present invention;

fig. 20 is a diagram of a partition structure of a display panel corresponding to another detection method provided in the embodiment of the present invention;

fig. 21 is a diagram of a partition structure of a display panel corresponding to another detection method provided in the embodiment of the present invention;

fig. 22 is a structural diagram of a display panel according to another detection method provided in the embodiment of the present invention;

fig. 23 is a schematic plan view of another display panel to be tested according to an embodiment of the present invention;

fig. 24 is a schematic plan view of another display panel to be tested according to an embodiment of 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, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

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.

Techniques, methods, and apparatus known to those 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 particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Referring to fig. 1 to fig. 3 in combination, fig. 1 is a schematic plan view of a display panel to be detected according to an embodiment of the present invention, fig. 2 is a schematic diagram of a detection method according to an embodiment of the present invention, fig. 3 is a block flow diagram of the detection method according to an embodiment of the present invention, in which the display panel to be detected 000 includes: a plurality of pixel driving circuits 10 arranged in an array, the display panel 000 further includes a plurality of light emitting elements 20, and the light emitting elements 20 correspond to and are electrically connected to the pixel driving circuits 10; wherein the plurality of pixel driving circuits 10 arranged in sequence along the first direction X form a pixel driving circuit row 10H0, the plurality of pixel driving circuit rows 10H0 are arranged in sequence along the second direction Y, the plurality of pixel driving circuits 10 arranged in sequence along the second direction Y form a pixel driving circuit column 10L0, the plurality of pixel driving circuit columns 10L0 are arranged in sequence along the first direction X, and the first direction X intersects the second direction Y;

m pixel drive circuit rows 10H0 are a pixel drive circuit row group 10H, and n pixel drive circuit columns 10L0 are a pixel drive circuit column group 10L; wherein m and n are positive integers;

the detection method comprises the following steps:

sequentially lighting the light emitting elements 20 corresponding to each pixel driving circuit row group 10H, and monitoring the first light emitting current I1 of the light emitting elements 20 of each pixel driving circuit row group 10H;

sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit column group 10L, and monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column group 10L;

by comparing each of the first light-emitting current I1 and the second light-emitting current I2, it is determined whether or not there is a display defect in the light-emitting element 20 in the display panel 000.

Specifically, the detection method in this embodiment may be used to detect whether the display panel 000 has a display dead pixel, the display panel 000 to be detected may be an organic light emitting diode display panel, and the display panel 000 to be detected may at least include a plurality of pixel driving circuits 10 and a plurality of light emitting elements 20 arranged in an array, where the light emitting elements 20 correspond to and are electrically connected to the pixel driving circuits 10, and the pixel driving circuits 10 are used to provide driving signals for the light emitting elements 20 to achieve light emitting display of the light emitting elements 20. Optionally, the light emitting element 20 of this embodiment may be an organic light emitting diode, and the pixel driving circuit 10 may include a plurality of transistors and storage capacitors that are electrically connected, and it is understood that, in this embodiment, a specific circuit connection structure of the pixel driving circuit 10 is not specifically limited, and may be understood by referring to a structure of a pixel driving circuit in the related art, which is not described herein again.

The plurality of pixel driving circuits 10 of the present embodiment may be arranged in an array, that is, the plurality of pixel driving circuits 10 arranged in sequence along the first direction X form a pixel driving circuit row 10H0, the plurality of pixel driving circuit rows 10H0 are arranged in sequence along the second direction Y, the plurality of pixel driving circuits 10 arranged in sequence along the second direction Y form a pixel driving circuit column 10L0, the plurality of pixel driving circuit columns 10L0 are arranged in sequence along the first direction X, and the first direction X intersects the second direction Y. The m pixel driving circuit rows 10H0 may serve as one pixel driving circuit row group 10H, the n pixel driving circuit columns 10L0 may serve as one pixel driving circuit column group 10L, and m and n are positive integers, that is, one pixel driving circuit row group 10H may include only one pixel driving circuit row 10H0, or one pixel driving circuit row group 10H may include two or more pixel driving circuit rows 10H 0; while one pixel driving circuit column group 10L may only include one pixel driving circuit column 10L0, or one pixel driving circuit column group 10L may include two or more pixel driving circuit columns 10L0, when the detection method of the present embodiment is specifically implemented, the number of pixel driving circuit rows 10H0 included in one pixel driving circuit row group 10H and the number of pixel driving circuit columns 10L0 included in one pixel driving circuit column group 10L may be defined according to actual requirements, which is not specifically limited in the present embodiment.

The detection method provided by the embodiment comprises the following steps:

s01: sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit row group 10H, monitoring the first light emitting current I1 of the light emitting element 20 of each pixel driving circuit row group 10H, that is, lighting each pixel driving circuit row group 10H along the second direction Y, and monitoring the first light emitting current I1 of the light emitting element 20 of each pixel driving circuit row group 10H that is sequentially lighted by a current detection device (such as an ammeter or an oscilloscope), where the results monitored by the current detection device are: along the second direction Y, the first light-emitting current of the light-emitting element 20 of the first pixel driving circuit row group 10H is I11, the first light-emitting current of the light-emitting element 20 of the second pixel driving circuit row group 10H is I12, and the first light-emitting current of the light-emitting element 20 of the third pixel driving circuit row group 10H is I13 … …, if the display panel 000 includes k pixel driving circuit row groups 10H in total along the second direction Y, the first light-emitting current I1 of the light-emitting element 20 of each pixel driving circuit row group 10H is sequentially obtained as I11, I12, and I13 … … I1 k;

s02: sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit column group 10L, monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column group 10L, i.e. lighting each pixel driving circuit column group 10L along the first direction X, and monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column group 10L which is sequentially lighted by a current detection device (such as an ammeter or an oscilloscope), where the results of the monitoring by the current detection device are as follows: when the display panel 000 includes p pixel driving circuit column groups 10L in total along the first direction X, the second light emission current I21 of the light emitting elements 20 in the first pixel driving circuit column group 10L, the second light emission current I22 of the light emitting elements 20 in the second pixel driving circuit column group 10L, and the second light emission current I23 … … of the light emitting elements 20 in the third pixel driving circuit column group 10L along the first direction X, the second light emission currents I2 of the light emitting elements 20 in each pixel driving circuit column group 10L are I21, I22, and I23 … … I2p in this order.

It is understood that the steps S01 and S02 of the present embodiment may be executed in the order that the step S01 is performed before the step S02, that is, the light emitting elements 20 corresponding to each pixel driving circuit row group 10H are sequentially turned on in the second direction Y, and the light emitting elements 20 corresponding to each pixel driving circuit column group 10L are sequentially turned on in the first direction X; or the step S01 and the step S02 may be executed in the order that the step S02 is performed before the step S01, that is, the light emitting elements 20 corresponding to each pixel driving circuit column group 10L are sequentially turned on along the first direction X, and the light emitting elements 20 corresponding to each pixel driving circuit row group 10H are sequentially turned on along the second direction Y.

S03: comparing each of the first light-emitting currents I1(I11, I12, I13 … … I1k) and each of the second light-emitting currents I2(I21, I22, I23 … … I2p), determining whether a display dead pixel exists in the light-emitting element 20 in the display panel 000, and if comparing each of the first light-emitting currents I1(I11, I12, I13 … … I1k), finding that the first light-emitting current of the light-emitting element 20 in one of the pixel driving circuit row groups 10H is I1 abnormal, and optionally, the current value abnormal may be understood as that the first light-emitting current I1 of the light-emitting element 20 in the pixel driving circuit row group 10H is different from the first light-emitting current I1 of the light-emitting elements 20 in the other pixel driving circuit row groups 10H; alternatively, the abnormal current value may be understood as that the first light emission current I1 of the light emitting element 20 of one of the pixel drive circuit row groups 10H is different from the standard current value, which indicates that the light emitting element 20 of the pixel drive circuit row group 10H has a display defect. Similarly, when the comparison of the second light-emitting currents I2(I21, I22, I23 … …, I2p) shows that the second light-emitting current of the light-emitting element 20 in one of the pixel driving circuit column groups 10L is I2 abnormal, and optionally, the current value abnormal may be understood as that the second light-emitting current I2 of the light-emitting element 20 in the pixel driving circuit column group 10L is different from the second light-emitting current I2 of the light-emitting element 20 in the other pixel driving circuit column group 10L, or the current value abnormal may be understood as that the second light-emitting current I2 of the light-emitting element 20 in one of the pixel driving circuit column groups 10L is different from the standard current value, which indicates that a display dead pixel exists in the light-emitting element 20 in the pixel driving circuit column group 10L. It is understood that the abnormal light emitting current of the light emitting elements 20 in the display panel 000 can indicate the abnormal light emitting brightness, so the manner of detecting the light emitting current can better reflect the situation of the light emitting brightness.

In the embodiment, by the above detection method, if there is no display dead pixel in the display panel 000 to be detected, a detection result can be obtained after one frame scanning at the fastest speed, that is, after at least one frame scanning time, by comparing each first light-emitting current I1(I11, I12, I13 … … I1k) and each second light-emitting current I2(I21, I22, I23 … … I2p), it is determined that there is no display dead pixel in the light-emitting element 20 in the display panel 000 if no current abnormality is found. Optionally, in order to further improve the detection accuracy, the detection time may be increased, and if no current abnormality is found after the scanning time of multiple frames, it may be determined that there is no display dead pixel in the light emitting element 20 in the display panel 000 more accurately. If a display panel 000 to be detected has a display dead pixel, the pixel driving circuit row group 10H where the display dead pixel is located can be determined by comparing each first light-emitting current I1(I11, I12, I13 … … I1k), and then the pixel driving circuit row group 10L where the display dead pixel is located can be obtained by comparing each second light-emitting current I2(I21, I22, I23 … … I2p), so that the pixel driving circuit row group 10H where the display dead pixel is located and the pixel driving circuit column group 10L are combined in a crossing manner, and a unit region where the display dead pixel is located can be obtained quickly (the pixel driving circuit row group 10H and the pixel driving circuit column group 10L are taken as a unit).

In this embodiment, the display panel 000 to be detected is normally lit by adopting an array scanning lighting manner, the first light emission current I1 of the light emitting element 20 during the operation of each pixel driving circuit row group 10H is monitored by the current detection device, when one or some first light emission currents I1 are abnormal, as shown in fig. 4, fig. 4 is a schematic diagram (shown by a waveform) of the first light emission current I1 of each pixel driving circuit row group 10H detected by the detection method provided by the embodiment of the present invention, and it can be known by combining fig. 2 and fig. 4 that the positions of the pixel driving circuit row groups 10H where the defective dots 1 and the defective dots 2 occur are shown by dashed boxes in fig. 2, and it is determined that the pixel driving circuit row group 10H or the pixel driving circuit row groups 10H where the defective dots occur display; observing the current of the pixel driving circuit row group 10H with the display dead pixel, monitoring the second light emitting current I2 of the light emitting element 20 during the operation of each pixel driving circuit column group 10L by lighting the light emitting elements of different pixel driving circuit column groups 10L, and when the second light emitting current I2 is abnormal, as shown in fig. 5, fig. 5 is a schematic diagram (shown by a waveform) of the second light emitting current I2 of each pixel driving circuit column group 10L detected by the detection method provided by the embodiment of the invention, and as can be seen from fig. 2 and fig. 5, when the positions of the pixel driving circuit column groups 10L with the dead pixels 1 and 2 are shown by a dashed line frame in fig. 2, it is confirmed that the pixel driving circuit column group 10L or the pixel driving circuit column groups 10L have the display dead pixels, and the coordinates of the row group and column group in which the display dead pixels are located can be obtained by combining the two (the dead pixel 1 is at the 2 nd pixel driving circuit row group 10H of the 2 nd pixel driving circuit column group 10H The area where the drive circuit column group 10L intersects, the dead pixel 2 is in the area where the 4 th pixel drive circuit column group 10L of the 3 rd pixel drive circuit row group 10H intersects). According to the detection method, the detection efficiency is greatly improved by the mode of scanning and lighting the light-emitting element 20 by the display panel 000 to be detected, on the premise of not adding expensive detection equipment, whether the display panel 000 has the display dead pixel and the unit area where the display dead pixel is located is judged quickly, the detection efficiency is high, whether the brightness of the light-emitting is normal or not can be accurately reflected by the current comparison method, and the detection accuracy is improved.

Alternatively, the pixel driving circuit 10 of the display panel 000 in this embodiment may be as shown in fig. 6, where fig. 6 is a circuit diagram of the pixel driving circuit and the light emitting element provided in this embodiment of the present invention. The pixel driving circuit 10 provided in fig. 6 may include at least 2 transistors and 1 storage capacitor (2T1C), the pixel driving circuit 10 includes a driving transistor M2 and a switching transistor M1, and is composed of 2 transistors M1, M2 and a storage capacitor C1, and a source and a drain of the driving transistor M2 are respectively connected to the second power supply voltage signal terminal PVDD and the anode of the light emitting element 20; the cathode of the light emitting element 20 is connected to a first power voltage signal terminal PVEE; two ends of the storage capacitor C1 are respectively connected with the second power supply voltage signal end PVDD and the gate of the driving transistor M2, the gate of the switching transistor M1 is used for connecting the scanning line, and the source and the drain of the switching transistor M1 are respectively connected withThe gate and data voltage signals Vdata of the driving transistor M2, respectively, wherein the light emitting current Id of the light emitting element 20 is k (Vgs- | Vth |)²Vgs is the voltage difference between the gate g and the source s of the driving transistor M2, Vth is the threshold voltage of the driving transistor M2, and k represents the intrinsic conductivity factor of the driving transistor M2, determined by the characteristics of the driving transistor M2 itself. As is apparent from the structure of the pixel driving circuit 10 shown in fig. 6, Vdata controls the potential of the node N1 in fig. 6, thereby determining the current flowing between the source and the drain of the driving transistor M2, that is, the light-emitting current Id ═ k (Vpvdd-Vdata) of the light-emitting element 20²Further, the luminance of the light emitting element 20 is determined, and if the light emitting current Id is abnormal while Vdata in the pixel driving circuit 10 is not changed, the abnormality is reflected in the light emitting luminance. Therefore, the manner of detecting the luminous current in the embodiment can better reflect the condition of the luminous brightness, namely, the luminous brightness can be accurately reflected by comparing the luminous current, and the detection precision is favorably improved.

It should be noted that fig. 1 of this embodiment only illustrates a block diagram of the pixel driving circuit, and fig. 6 illustrates an exemplary circuit structure in which the pixel driving circuit 10 is 2T1C, which includes but is not limited to this structure, and in a specific implementation, the pixel driving circuit 10 may also have another structure, and this embodiment is not limited in particular.

It should be further explained that fig. 1 of this embodiment only illustrates the structure of the display panel 000, including but not limited to the above structure, and may also include other structures capable of achieving the display effect, and in specific implementation, the structure of the display panel in the related art may be referred to for understanding, and this embodiment is not described herein again.

Optionally, in the present embodiment, the light emitting element 20 corresponding to each pixel driving circuit row group 10H is sequentially turned on, and the first light emitting current I1 of the light emitting element 20 of each pixel driving circuit row group 10H is monitored; the detection method for sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit column group 10L and monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column group 10L has a low requirement on the measurement rate of the current detection device, that is, when the measurement rate of the current detection device is low, the light emitting element 20 corresponding to one pixel driving circuit row group 10H may be sequentially lighted during the detection process, then the first light emitting current I1 of the light emitting element 20 of the pixel driving circuit row group 10H is monitored by the current detection device, then the light emitting element 20 corresponding to the next pixel driving circuit row group 10H is lighted, and then the first light emitting current I1 of the light emitting element 20 of the pixel driving circuit row group 10H is monitored by the current detection device, and thus the detection is sequentially performed. Or when the detection method of this embodiment is used, if the measurement rate of the adopted current detection device is low, the frequency of the scan frame of the display panel 000 can be appropriately reduced, so that the low measurement rate of the current detection device is applied, and the detection accuracy is ensured.

Optionally, as shown in fig. 6, the pixel driving circuit 10 provided in this embodiment includes a first power voltage signal terminal PVEE, which provides a first power voltage signal Vpvee for the light emitting element 20;

the monitoring end of the luminous current is connected with a first power supply voltage signal end PVEE.

The present embodiment explains that the light emitting current Id of the light emitting element 20 is a current flowing between the source and the drain of the driving transistor M3, that is, a current of the first power voltage signal terminal PVEE, so that the present embodiment connects the monitoring terminal of the light emitting current to the first power voltage signal terminal PVEE, which can avoid increasing the complexity of connecting the monitoring terminal of the light emitting current of the current detection device to the pixel driving circuit 10, and is beneficial to the simplification of the detection circuit.

It can be understood that the second power voltage signal terminal PVDD in this embodiment is used for providing the second power voltage signal Vpvdd for the pixel driving circuit 10, and has no direct relation with the light emitting device 20 itself, and the first power voltage signal Vpvee provided by the first power voltage signal terminal PVEE is directly provided to one pole of the light emitting device 20, and the monitoring terminal of the light emitting current is connected to the first power voltage signal terminal PVEE, so that the light emitting current of the light emitting device 20 can be better monitored by the monitoring terminal of the light emitting current, so as to achieve a better detection effect.

Optionally, the current detection device in this embodiment may be any one of an ammeter and an oscilloscope, that is, the monitoring end of the light-emitting current connected to the first power supply voltage signal end PVEE is connected to any one of the ammeter and the oscilloscope. It should be noted that, in order to improve the detection accuracy, the ammeter or the oscilloscope connected to the monitoring end of the light-emitting current may be a high-accuracy ammeter or oscilloscope, and this embodiment does not specifically limit the current detection device to be digital or analog, and may be selectively set according to actual requirements during specific implementation.

In some optional embodiments, please refer to fig. 1, fig. 2, fig. 4-fig. 6, and fig. 7 in combination, fig. 7 is another flow chart of the detection method according to the embodiment of the present invention, where the detection method according to the embodiment includes:

by comparing each of the first light-emitting current I1 and the second light-emitting current I2, it is determined whether or not there is a display defect in the light-emitting element 20 in the display panel 000. The specific method for determining whether the light emitting elements 20 in the display panel 000 have the display dead pixel includes:

each monitored first luminous current I1 is compared with a preset first luminous current I₀1, comparing each monitored second light-emitting current I2 with a preset second light-emitting current I₀2, comparing;

if the monitored first luminous current I1I of the ith pixel driving circuit row group 10H and the preset first luminous current I are detected₀1, if the display panel 000 has a display dead pixel, the ith pixel driving circuit row group 10H of the display panel 000 is positioned;

if the monitored second light-emitting current I2j of the jth pixel driving circuit column group 10L and the preset second light-emitting current I are the same₀2 different, the jth pixel driving circuit column group 10L of the positioning display panel 000 existsDisplaying a dead pixel;

thereby obtaining the area coordinate [ i, j ] of the display dead pixel, i.e., the area defined by the intersection of the ith pixel driving circuit row group 10H and the jth pixel driving circuit column group 10L. Wherein i and j are positive integers.

This embodiment explains that the specific method for determining whether there is a display dead pixel in the light emitting element 20 in the display panel 000 by comparing each of the first light emitting current I1 and the second light emitting current I2 in step S03 includes:

s031: each monitored first luminous current I1 is compared with a preset first luminous current I₀1 (standard value of the first luminescence current I1), optionally presetting the first luminescence current I₀1, the predetermined first light-emitting current I can be obtained by detecting the standard qualified display panel 000 through the current detection device, detecting the light-emitting current of the light-emitting element 20 of each pixel driving circuit row group 10H in the standard qualified display panel 000 for multiple times, and averaging the light-emitting currents₀1; as shown in fig. 4, the first luminescence currents other than the first luminescence currents I12 and I13 can be understood as corresponding to the preset first luminescence current I₀1 are substantially identical or identical.

Each monitored second light emitting current I2 is compared with the preset second light emitting current I₀2 (standard value of the second light-emitting current I2), optionally, presetting the second light-emitting current I₀2, the standard qualified display panel 000 may be detected by the current detection device, the light emitting current of the light emitting element 20 of each pixel driving circuit column group 10L in the standard qualified display panel 000 may be detected for multiple times, and the average value is obtained to obtain the preset second light emitting current I₀2; the second light-emitting currents other than the second light-emitting currents I22 and I23 in FIG. 5 can be understood as the preset second light-emitting current I₀2 are substantially identical or identical.

S032: if the monitored first luminous current I1I of the ith pixel driving circuit row group 10H and the preset first luminous current I are detected₀1 different, optionally, the ith row of pixel drive circuits monitoredThe first luminous current I1I of the group 10H may be greater than the predetermined first luminous current I₀1, or less than the preset first luminous current I₀1, no matter the monitored first luminous current I1I of the ith pixel driving circuit row group 10H and the preset first luminous current I₀1, it is only necessary to satisfy the monitored first luminescence current I1I of the ith pixel driving circuit row group 10H and the preset first luminescence current I₀1, it can position that the ith pixel driving circuit row group 10H of the display panel 000 has a display dead pixel; wherein the monitored first luminescence current I1I of the ith pixel driving circuit row group 10H and the preset first luminescence current I₀1 difference is understood to mean a difference between the two which is large and far outside the tolerance of the measurement error.

S033: if the monitored second light-emitting current I2j of the jth pixel driving circuit column group 10L and the preset second light-emitting current I are the same₀2 differently, optionally, the monitored second light emitting current I2j of the jth pixel driving circuit column group 10L may be greater than the preset second light emitting current I₀2, or less than the preset second light-emitting current I₀2, no matter the monitored second light-emitting current I2j of the jth pixel driving circuit column group 10L and the preset second light-emitting current I₀2, it is only necessary to satisfy the monitored second light-emitting current I2j of the jth pixel driving circuit column group 10L and the preset second light-emitting current I₀2, if the difference is greater, it can be determined that a display dead pixel exists in the jth pixel driving circuit column group 10L of the display panel 000; wherein the monitored second light emitting current I2j of the jth pixel driving circuit column group 10L and the preset second light emitting current I₀2 different can be understood as the difference between the two is large and far beyond the tolerance range of the measurement error.

S034: therefore, the coordinates of the area displaying the dead pixel in the display panel 000 are [ i, j ], that is, the area defined by the intersection of the ith pixel driving circuit row group 10H and the jth pixel driving circuit column group 10L can be obtained; as illustrated in fig. 2, the coordinates of the area where the defective pixel 1 is located are [2,2], and the coordinates of the area where the defective pixel 2 is located are [3,4 ].

The method for determining whether the display dead pixel exists in the light emitting element 20 of the display panel 000 of the embodiment can improve the detection efficiency, and can accurately reflect whether the light emitting brightness is normal or not through the current comparison method, thereby being beneficial to improving the detection precision.

In some alternative embodiments, please refer to fig. 8-10 in combination, fig. 8 is a schematic plan view of another planar structure of a display panel to be detected according to an embodiment of the present invention, fig. 9 is a schematic diagram of another detection method according to an embodiment of the present invention, fig. 10 is another flow chart of the detection method according to an embodiment of the present invention, in this embodiment, m pixel driving circuit rows 10H0 are a pixel driving circuit row group 10H, and n pixel driving circuit rows 10L0 are a pixel driving circuit column group 10L; where m is 1 and n is 1, that is, one pixel driving circuit row 10H0 is one pixel driving circuit row group 10H, and one pixel driving circuit column 10L0 is one pixel driving circuit column group 10L;

the detection method comprises the following steps:

sequentially lighting the light emitting elements 20 corresponding to each pixel driving circuit row 10H0, and monitoring the first light emitting current I1 of the light emitting elements 20 of each pixel driving circuit row 10H 0;

sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit column 10L0, and monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column 10L 0;

by comparing each of the first light-emitting current I1 and the second light-emitting current I2, it is determined whether there is a display dead pixel in the light-emitting element 20 in the display panel 000:

if the monitored first light-emitting current I1I of the ith pixel driving circuit row 10H0 and the preset first light-emitting current I are detected₀1 is different, the display dead pixel exists in the ith pixel driving circuit row 10H0 of the display panel 000;

if the monitored jth pixel driving circuit row 10The second light-emitting current I2j of L0 and the predetermined second light-emitting current I₀2, if the difference is not, the display dead pixel exists in the jth pixel driving circuit column 10L0 of the display panel 000;

thus, the area coordinate [ i, j ] of the display dead pixel is the coordinate of the display dead pixel.

This embodiment explains that when m pixel drive circuit rows 10H0 are one pixel drive circuit row group 10H, n pixel drive circuit columns 10L0 are one pixel drive circuit column group 10L, and m is 1 and n is 1, that is, one pixel drive circuit row 10H0 is one pixel drive circuit row group 10H, and one pixel drive circuit column 10L0 is one pixel drive circuit column group 10L, the detection method adopts an array scanning lighting manner in which one pixel drive circuit row 10H0 is sequentially lit and one pixel drive circuit column 10L0 is sequentially lit, and a specific detection method includes:

s11: sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit row 10H0, monitoring the first light emitting current I1 of the light emitting element 20 of each pixel driving circuit row 10H0, i.e. lighting each pixel driving circuit row 10H0 along the second direction Y, and monitoring the first light emitting current I1 of the light emitting element 20 of each sequentially lighting pixel driving circuit row 10H0 by a current detection device (such as a current meter or an oscilloscope) as the result of monitoring by the current detection device: if the display panel 000 includes k pixel driving circuit rows 10H0 in total along the second direction Y, the first light emission currents I1 of the light emitting elements 20 of each pixel driving circuit row 10H0 are sequentially obtained as I11, I12, I13 … … I1k if the first light emission currents of the light emitting elements 20 of the first pixel driving circuit row 10H0 are I11, the first light emission currents of the light emitting elements 20 of the second pixel driving circuit row 10H0 are I12, and the first light emission currents of the light emitting elements 20 of the third pixel driving circuit row 10H0 are I13 … …;

s12: sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit column 10L0, monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column 10L0, i.e. lighting each pixel driving circuit column 10L0 along the first direction X, and monitoring the second light emitting current I2 of the light emitting element 20 of each sequentially lighting pixel driving circuit column 10L0 by a current detection device (such as a current meter or an oscilloscope) according to the following monitoring results: when the display panel 000 includes p pixel driving circuit columns 10L0 in the first direction X in total, the second light emission current I2 of the light emitting element 20 of each pixel driving circuit column 10L0 is I21, I22, and I23 … … I2p, the second light emission current I21 of the light emitting element 20 of the first pixel driving circuit column 10L0, the second light emission current I22 of the light emitting element 20 of the second pixel driving circuit column 10L0, and the second light emission current I23 … … of the light emitting element 20 of the third pixel driving circuit column 10L0 are sequentially obtained for each pixel driving circuit column 10L 0.

S13: comparing each of the first light-emitting currents I1(I11, I12, I13 … … I1k) and each of the second light-emitting currents I2(I21, I22, I23 … … I2p), determining whether a display dead pixel exists in the light-emitting element 20 in the display panel 000, and if comparing each of the first light-emitting currents I1(I11, I12, I13 … … I1k), finding that the first light-emitting current of the light-emitting element 20 in one of the pixel driving circuit rows 10H0 is I1 abnormal, and optionally, the current value abnormal may be understood as that the first light-emitting current I1 of the light-emitting element 20 in the pixel driving circuit row 10H0 is different from the first light-emitting current I1 of the light-emitting elements 20 in the other pixel driving circuit row 10H 0; alternatively, the abnormal current value may be understood as that the first light-emitting current I1 of the light-emitting elements 20 in one of the pixel driving circuit rows 10H0 is different from the standard current value, which indicates that the light-emitting elements 20 in the pixel driving circuit row 10H0 have a display defect. Similarly, when the comparison between the second light-emitting currents I2(I21, I22, I23 … … I2p) shows that the second light-emitting current of the light-emitting element 20 of one of the pixel driving circuit columns 10L0 is I2 abnormal, and optionally, the current value abnormal may be understood as that the second light-emitting current I2 of the light-emitting element 20 of the pixel driving circuit column 10L0 is different from the second light-emitting current I2 of the light-emitting element 20 of the other pixel driving circuit column 10L0, or the current value abnormal may be understood as that the second light-emitting current I2 of the light-emitting element 20 of one of the pixel driving circuit columns 10L0 is different from the standard current value, which indicates that a display dead pixel exists in the light-emitting element 20 of the pixel driving circuit column 10L 0. By comparing each of the first light emitting currents I1(I11, I12, I13 … … I1k) and each of the second light emitting currents I2(I21, I22, I23 … … I2p), it is determined whether there is a display dead pixel in the light emitting element 20 in the display panel 000, specifically:

s131: each monitored first luminous current I1 is compared with a preset first luminous current I₀1, comparing each monitored second light-emitting current I2 with a preset second light-emitting current I₀2, comparing;

s132: if the monitored first light-emitting current I1I of the ith pixel driving circuit row 10H0 and the preset first light-emitting current I are detected₀1, it can locate that the ith pixel driving circuit row 10H0 of the display panel 000 has a display dead pixel;

s133: if the monitored second light-emitting current I2j of the jth pixel driving circuit row 10L0 is equal to the preset second light-emitting current I₀2, it can be located that there is a display dead pixel in the jth pixel driving circuit column 10L0 of the display panel 000;

s134: therefore, the area coordinate [ i, j ] of the display panel 000 where the dead pixel is displayed can be obtained as the coordinate of the display dead pixel, namely, the position defined by the intersection of the ith pixel driving circuit row 10H0 and the jth pixel driving circuit column 10L 0; one showing the coordinates of dead pixel 1 as [2,2] and the other showing the coordinates of dead pixel 2 as [3,4] as illustrated in fig. 9.

In the embodiment, by the above detection method, if there is no display dead pixel in the display panel 000 to be detected, a detection result can be obtained most quickly after one frame time, that is, after at least one frame time, by comparing each of the first light-emitting currents I1(I11, I12, I13 … … I1k) and each of the second light-emitting currents I2(I21, I22, I23 … … I2p), if there is no current abnormality, it is determined that there is no display dead pixel in the light-emitting element 20 in the display panel 000. Here, one frame time refers to a time required to scan all the pixel driving circuit lines in the display panel 000 once. Optionally, in order to further improve the detection accuracy, the time for detecting and sampling may be increased, and if no current abnormality is found after the scanning time of multiple frames, it may be determined more accurately that no display dead pixel exists in the light emitting element 20 in the display panel 000. If a display panel 000 to be detected has a display dead pixel, the pixel driving circuit row 10H0 where the display dead pixel is located can be determined by comparing each first light-emitting current I1(I11, I12, I13 … … I1k), and then the pixel driving circuit column 10L0 where the display dead pixel is located can be obtained by comparing each second light-emitting current I2(I21, I22, I23 … … I2p), so that the pixel driving circuit row 10H0 where the display dead pixel is located and the pixel driving circuit column 10L0 are combined in a crossing manner, and the coordinate where the display dead pixel is located can be obtained quickly (the pixel driving circuit row 10H0 and the pixel driving circuit column 10L0 are taken as units).

The method for judging whether the display dead pixel exists in the light emitting element 20 in the display panel 000 can judge whether the display dead pixel exists in the display panel 000 and the position where the display dead pixel is located, so that the detection efficiency is high, and whether the brightness of the emitted light is normal or not can be accurately reflected by a current comparison method, thereby being beneficial to improving the detection precision.

Optionally, when the measurement rate of the current detection device adopted in the detection method in this embodiment is higher, the entire display panel 000 may be lit, and while the display panel 000 is lit, the current detection device with the higher measurement rate sequentially monitors the first light emission currents I1 of the light emitting elements 20 of each pixel driving circuit row 10H0, and each monitored first light emission current I1 is equal to a preset first light emission current I1₀Comparing the first current I2 with the second current I2, monitoring the second light emitting current I2 of the light emitting elements 20 of each pixel driving circuit row 10L0, and comparing the second light emitting current I2 with a preset second light emitting current I₀2, sequentially detecting the current to obtain the coordinate position of the dead pixel displayed in the display panel 000, thereby saving the time for lighting the display panel 000 and being beneficial to reducing the detection time.

Optionally, with continuing to refer to fig. 4 and fig. 5, and fig. 8 to fig. 10 in combination, in the detection method provided in this embodiment, if the monitored first light-emitting current I1 of the ith pixel driving circuit row group 10H (because m is 1, it indicates that one pixel driving circuit row 10H0 is one pixel driving circuit row group 10H), is greater than the predetermined first light-emitting current I1Setting a first luminous current I₀1 and/or the monitored second light-emitting current I2 of the jth pixel driving circuit column group 10L (since n is 1, it means that one pixel driving circuit column 10L0 is one pixel driving circuit column group 10L) is larger than the preset second light-emitting current I₀2, displaying that the dead pixel is a bright point;

if the monitored first light-emitting current I1 of the ith pixel driving circuit row group 10H (since m is 1, it means that one pixel driving circuit row 10H0 is one pixel driving circuit row group 10H) is smaller than the preset first light-emitting current I₀1, and/or the monitored second light-emitting current I2 of the jth pixel driving circuit column group 10L (since n is 1, it means that one pixel driving circuit column 10L0 is one pixel driving circuit column group 10L) is smaller than the preset second light-emitting current I₀2, the dead pixel is a dark pixel.

This embodiment further explains that after determining the coordinate position of the display dead pixel in the display panel 000 to be detected, the size of the abnormal current value may be analyzed to obtain whether the property of the display dead pixel is a dark dot or a bright dot, and the analysis method may be: when m is 1, that is, one pixel driving circuit row 10H0 is one pixel driving circuit row group 10H, n is 1, that is, one pixel driving circuit row 10L0 is one pixel driving circuit column group 10L, if the monitored first light-emitting current I1 of the ith pixel driving circuit row 10H0 is greater than the preset first light-emitting current I1₀1, and/or the monitored second light emitting current I2 of the jth pixel driving circuit column 10L0 is greater than the preset second light emitting current I₀2, the dead pixel is a bright point. In the embodiment, the relationship between the abnormal current value and the preset standard current value is analyzed and compared, so that the type of the dead pixel displayed in the display panel 000 can be accurately obtained, the detection mode is simple and rapid, and the detection accuracy is high.

As shown in fig. 11 and 12, fig. 11 is another schematic diagram (shown by a waveform) of the first light-emitting current I1 of each pixel driving circuit row group 10H detected by the detection method provided by the embodiment of the invention, and fig. 12 is another schematic diagram (shown by a waveform) of the second light-emitting current I2 of each pixel driving circuit column group 10L detected by the detection method provided by the embodiment of the inventionAs can be seen from fig. 9, 11 and 12, the positions of the pixel driving circuit rows 10H0 and the pixel driving circuit columns 10L0 where the defective dots 1 and 2 appear are as shown in fig. 9, and the first light-emitting current I1 corresponding to the defective dot 1 is greater than the preset first light-emitting current I1₀1, the second light emitting current I2 corresponding to the dead pixel 1 is greater than the preset second light emitting current I₀2, the two bad dots 1 and 2 are confirmed to be bright spots.

As shown in fig. 4 and 5, as can be seen from fig. 9, 4 and 5, the positions of the pixel driving circuit row 10H0 and the pixel driving circuit column 10L0 where the defective pixel 1 and the defective pixel 2 appear are shown in fig. 9, and the first light-emitting current I1 corresponding to the defective pixel 1 is smaller than the preset first light-emitting current I1₀1, the second light emitting current I2 corresponding to the dead pixel 1 is smaller than the preset second light emitting current I₀2, confirming that the dead pixel types of the two dead pixels 1 and 2 are dark points.

As shown in fig. 13 and fig. 14, fig. 13 is another schematic diagram (shown by a waveform) of the first light-emitting current I1 of each pixel driving circuit row group 10H detected by the detection method provided by the embodiment of the invention, fig. 14 is another schematic diagram (shown by a waveform) of the second light-emitting current I2 of each pixel driving circuit column group 10L detected by the detection method provided by the embodiment of the invention, and it can be known from fig. 9, fig. 13 and fig. 14 that the positions of the pixel driving circuit row 10H0 and the pixel driving circuit column 10L0 where the dead pixel 1 and the dead pixel 2 appear are shown in fig. 9, and since the first light-emitting current I1 corresponding to the dead pixel 1 is greater than the preset first light-emitting current I0, the first light-emitting current I0 is greater than the preset first light-emitting current I359₀1, the second light emitting current I2 corresponding to the dead pixel 1 is smaller than the preset second light emitting current I₀2, the defective pixel types of the two defective pixels 1 are determined to be bright points, and the defective pixel type of the defective pixel 2 is determined to be dark points.

In some alternative embodiments, please refer to fig. 1-7, 15 and 16 in combination, where fig. 15 is a partially enlarged view of a defective pixel 1 area in fig. 2, and fig. 16 is another flow chart of the detection method according to the embodiment of the present invention, in this embodiment, m pixel driving circuit rows 10H0 are a pixel driving circuit row group 10H, and n pixel driving circuit columns 10L0 are a pixel driving circuit column group 10L; wherein m is greater than or equal to 2, n is greater than or equal to 2, that is, two or more pixel driving circuit rows 10H0 are a pixel driving circuit row group 10H, and two or more pixel driving circuit columns 10L0 are a pixel driving circuit column group 10L; the detection method comprises the following steps:

s21: sequentially lighting the light emitting elements 20 corresponding to each pixel driving circuit row group 10H, and monitoring the first light emitting current I1 of the light emitting elements 20 of each pixel driving circuit row group 10H;

s22: sequentially lighting the light emitting element 20 corresponding to each pixel driving circuit column group 10L, and monitoring the second light emitting current I2 of the light emitting element 20 of each pixel driving circuit column group 10L;

s23: by comparing each of the first light-emitting current I1 and the second light-emitting current I2, it is determined whether or not there is a display defect in the light-emitting element 20 in the display panel 000.

S231: each monitored first luminous current I1 is compared with a preset first luminous current I₀1, comparing each monitored second light-emitting current I2 with a preset second light-emitting current I₀2, comparing;

s232: if the monitored first luminous current I1I of the ith pixel driving circuit row group 10H and the preset first luminous current I are detected₀1, if the display panel 000 has a display dead pixel, the ith pixel driving circuit row group 10H of the display panel 000 is positioned;

s233: if the monitored second light-emitting current I2j of the jth pixel driving circuit column group 10L and the preset second light-emitting current I are the same₀2, if the difference is not, the display dead pixel exists in the jth pixel driving circuit column group 10L of the display panel 000;

s234: thereby obtaining the area coordinate [ i, j ] of the display dead pixel, i.e., the area defined by the intersection of the ith pixel driving circuit row group 10H and the jth pixel driving circuit column group 10L. Wherein i and j are positive integers.

S24: according to the area coordinates [ i, j ] of the display dead pixel;

sequentially lighting each row of light-emitting elements 20 in the ith pixel driving circuit row group 10H along the second direction Y, and monitoring a first sub-light-emitting current I1-1 of each row of light-emitting elements 20 in the ith pixel driving circuit row group 10H;

s25: sequentially lighting each light-emitting element 20 in the jth pixel drive circuit column group 10L along the first direction X, and monitoring a second sub-light-emitting current I2-1 of each light-emitting element 20 in the jth pixel drive circuit column group 10L;

s26: the coordinates showing the dead pixel are determined in the coordinates [ I, j ] of the area showing the dead pixel by comparing each of the first and second sub light emitting currents I1-1 and I2-1.

The present embodiment explains that when one pixel driving circuit row group 10H includes two or more pixel driving circuit rows 10H0, and one pixel driving circuit column group 10L includes two or more pixel driving circuit columns 10L0, the detection method of the display panel 000 of the present embodiment may further perform further detection by individually lighting all the pixel driving circuit rows 10H0 and the pixel driving circuit columns 10L0 of the area where a dead pixel is displayed, after determining whether a display dead pixel exists in the light emitting element 20 in the display panel 000 and the area coordinate of the display dead pixel is [ I, j ] by comparing each of the first light emitting current I1 and the second light emitting current I2, to determine the specific coordinate position of the display dead pixel. It can be understood that, in this embodiment, details of how to determine whether the light emitting elements 20 in the display panel 000 have the display dead pixel and how to determine that the area coordinate of the display dead pixel is [ i, j ] are not repeated, and specific reference may be made to the detection method in the above embodiment. This embodiment mainly explains how, after determining that the coordinates of the area displaying the dead pixel are [ i, j ], a detection method for further detecting to determine a specific coordinate position displaying the dead pixel may be: sequentially lighting each row of light-emitting elements 20 in the ith pixel driving circuit row group 10H along the second direction Y according to the area coordinate [ I, j ] for displaying the dead pixel, and monitoring the first sub-light-emitting current I1-1 of each row of light-emitting elements 20 in the ith pixel driving circuit row group 10H; sequentially lighting each light-emitting element 20 in the jth pixel drive circuit column group 10L along the first direction X, and monitoring a second sub-light-emitting current I2-1 of each light-emitting element 20 in the jth pixel drive circuit column group 10L; the coordinates showing the dead pixel are determined in the coordinates [ I, j ] of the area showing the dead pixel by comparing each of the first and second sub light emitting currents I1-1 and I2-1.

In this embodiment, by adopting a manner of lighting each pixel driving circuit row and pixel driving circuit column in the area where the display dead pixel is located by array scanning, the area where the determined display dead pixel is located in the display panel 000 to be detected is individually lighted, and the current detection device is used to monitor the first sub-light-emitting current I1-1 of the light-emitting element 20 during the operation of each pixel driving circuit row 10H0 in the area where the display dead pixel is located, if the result monitored by the current detection device is: in the area coordinate [ I, j ] of the dead pixel display along the second direction Y, the first sub light-emitting current of the light-emitting element 20 in the first pixel driving circuit row 10H0 is I1-11, the first sub light-emitting current of the light-emitting element 20 in the second pixel driving circuit row 10H0 is I1-12, the first light-emitting current of the light-emitting element 20 in the third pixel driving circuit row 10H0 is I1-13 … …, and if the area coordinate [ I, j ] of the dead pixel display includes r pixel driving circuit rows 10H0 in total along the second direction Y, the first sub light-emitting current I1-1 of the light-emitting element 20 in each pixel driving circuit row 10H0 is sequentially obtained as I1-11, I1-12, I1-13 … … I1-1 r; when one or some of the first sub-emission currents I1-1 are abnormal, as shown in fig. 17, fig. 17 is a schematic diagram (shown by a waveform) of the first sub-emission current I1-1 of each pixel driving circuit row 10H0 in the area where the display dead pixel 1 is located, which is detected by the detection method provided by the embodiment of the present invention, and as can be seen from fig. 15 and 17, the position of the pixel driving circuit row 10H0 where the dead pixel 1 appears is shown in fig. 17, it is determined that the display dead pixel appears in the pixel driving circuit row 10H 0; observing the current of the pixel driving circuit row 10H0 in which the defective pixel 1 is displayed, lighting the light emitting element 20 of each pixel driving circuit column 10L0 in the area in which the defective pixel 1 is displayed, monitoring the second sub light emitting current I2-1 of the light emitting element 20 during the operation of each pixel driving circuit column 10L0 by a current detection device, as the result of monitoring by the current detection device: in the area coordinate [ I, j ] of displaying the dead pixel along the first direction X, the second sub light-emitting current I2-11 of the light-emitting element 20 of the first pixel driving circuit column 10L0, the second sub light-emitting current I2-12 of the light-emitting element 20 of the second pixel driving circuit column 10L0, and the second sub light-emitting current I2-13 … … of the light-emitting element 20 of the third pixel driving circuit column 10L0, if a total of s pixel driving circuit columns 10L0 are included along the first direction X in the area coordinate [ I, j ] of displaying the dead pixel, the first sub light-emitting current I2-1 of the light-emitting element 20 of each pixel driving circuit column 10L0 is sequentially obtained as I2-11, I2-12, I2-13I 2-1 s; when the second sub light emitting current I2-1 is abnormal, as shown in fig. 18, fig. 18 is a schematic diagram (shown by a waveform) of the second sub light emitting current I2-1 of each pixel driving circuit column 10L0 in the area where the dead pixel 1 is displayed, which is detected by the detection method provided by the embodiment of the present invention, and as can be seen from fig. 15 and fig. 18, the position of the pixel driving circuit column 10L0 where the dead pixel 1 appears is as shown in fig. 17, so as to obtain the position where the 3 rd pixel driving circuit column 10L0 of the 2 nd pixel driving circuit row 10H0 in the area coordinate [ I, j ] of the dead pixel 1 intersects.

In the detection method of this embodiment, after determining whether the light emitting element 20 in the display panel 000 has a display dead pixel and the area coordinate of the display dead pixel is [ i, j ], all the pixel driving circuit rows 10H0 and the pixel driving circuit columns 10L0 in the area where the display dead pixel is located are independently lighted for further detection, so as to determine the specific coordinate position of the display dead pixel.

It is understood that the current value abnormality of the present embodiment can be understood that the first sub light emission current I1-1 of the light emitting elements 20 of the pixel driving circuit row 10H0 is different from the first sub light emission current I1-1 of the light emitting elements 20 of the other pixel driving circuit row 10H 0; alternatively, the current value anomaly may be understood as that the first sub-emission current I1-1 of the light-emitting elements 20 of one pixel driving circuit row 10H0 is different from a standard current value (which may be obtained by measuring a standard display panel in advance), which indicates that the light-emitting elements 20 of the pixel driving circuit row 10H0 have a display dead pixel, and the present embodiment is not particularly limited.

In some alternative embodiments, please refer to fig. 1-7, 15-18 and 19 in combination, fig. 19 is another flowchart of a detecting method according to an embodiment of the present invention, in which the method for determining the coordinates of the displayed dead pixel in the coordinates [ i, j ] of the area where the dead pixel is displayed includes:

each monitored first sub-luminous current I1-1 is compared with a preset first sub-luminous current I₀1-1, and comparing each monitored second sub-luminous current I2-1 with a preset second sub-luminous current I₀2-1 comparison;

if the monitored first sub-emitting current I1-1a of the lighting element 20 in the a-th row is equal to the preset first sub-emitting current I₀1-1, if the display panel is different, the lighting element 20 in the a-th row of the display panel is located to have a display dead pixel, wherein the pixel driving circuit 10 corresponding to the lighting element 20 in the a-th row is located in the ith pixel driving circuit row group 10H;

if the detected second sub-light-emitting current I2-1b of the lighting element 20 in the b-th row is equal to the preset second sub-light-emitting current I₀2-1, if there is a display dead pixel in the b-th row of light-emitting elements 20 of the display panel, the pixel driving circuit 10 corresponding to the b-th row of light-emitting elements 20 is located in the jth pixel driving circuit column group 10L;

thereby obtaining coordinates [ a, b ] showing the dead pixel.

This embodiment explains that a specific method of determining the coordinates of the display dead pixel in the area coordinates [ I, j ] of the display dead pixel by comparing each of the first sub light emitting current I1-1 and the second sub light emitting current I2-1 in step S26 includes:

s261: each monitored first sub-luminous current I1-1 is compared with a preset first sub-luminous current I₀1-1 (standard value of the first sub-luminous current I1-1), optionally, presetting the first sub-luminous current I₀1-1, the area coordinate [ i, j ] of the defective pixel in the standard qualified display panel 000 can be detected for multiple times]The light emitting currents of the light emitting elements 20 in each pixel driving circuit row 10H0 are averaged to obtain a predetermined first sub-light emitting current I₀1-1, further optionally, presetting a first luminescence current I₀1 and presetting a first sub-luminescenceCurrent I₀1-1 may be the same and each represents a standard current value of the light emitting element 20 in the standard qualified display panel 000; the first sub light emitting current except the first sub light emitting current I1-12 as shown in fig. 17 can be understood as the preset first sub light emitting current I₀1-1 are substantially identical or identical.

And each monitored second sub-light-emitting current I2-1 is equal to the preset second sub-light-emitting current I₀2-1 (standard value of the second sub-luminous current I2-1), optionally presetting the second sub-luminous current I₀2-1, the area coordinate [ i, j ] of the defective pixel in the standard qualified display panel 000 can be detected for multiple times]The light emitting current of the light emitting element 20 in each pixel driving circuit row 10L0 is averaged to obtain the predetermined second sub-light emitting current I₀2-1, further optionally, presetting a second light-emitting current I₀2 and a predetermined second sub-emission current I₀2-1 may be the same and each represents a standard current value of the light emitting element 20 in the standard qualified display panel 000; the second sub light emitting currents other than the second sub light emitting current I2-13 in FIG. 18 can be understood as corresponding to the predetermined second sub light emitting current I₀2-1 are substantially identical or identical.

S262: if the monitored first sub-emitting current I1-1a of the lighting element 20 in the a-th row is equal to the preset first sub-emitting current I₀1-1. optionally, the monitored first sub-emission current I1-1a of the lighting element 20 of the a-th row may be greater than the preset first sub-emission current I₀1-1, and possibly less than the predetermined first sub-emission current I₀1-1, and regardless of the monitored first sub-emitting current I1-1a of the lighting element 20 in the a-th row and the preset first sub-emitting current I₀1-1, the monitored first sub-emitting current I1-1a of the lighting element 20 in the a-th row and the preset first sub-emitting current I need only be satisfied₀1-1, the display panel can be positioned that the lighting element 20 in the a-th row has a display dead pixel, and the pixel driving circuit 10 corresponding to the lighting element 20 in the a-th row is located in the ith pixel driving circuit rowGroup 10H; wherein the monitored first sub-emitting current I1-1 of the lighting element 20 in the a-th row is equal to the preset first sub-emitting current I₀1-1 difference is understood to mean a difference between the two that is large and far outside the tolerance of the measurement error.

S263: if the detected second sub-light-emitting current I2-1b of the lighting element 20 in the b-th row is equal to the preset second sub-light-emitting current I₀2-1. alternatively, the monitored second sub-emission current I2-1b of the lighting element 20 in the b-th column may be greater than the predetermined second sub-emission current I₀2-1, and possibly less than the predetermined second sub-emission current I₀2-1, and regardless of the monitored second sub-lighting current I2-1b of the lighting element 20 in the b-th row and the preset second sub-lighting current I₀2-1, the monitored second sub-emission current I2-1b of the lighting element 20 in the b-th row and the predetermined second sub-emission current I are only required to satisfy₀2-1, if there is a display dead pixel in the b-th row of light-emitting elements 20 of the display panel, the pixel driving circuit 10 corresponding to the b-th row of light-emitting elements 20 is located in the jth pixel driving circuit column group 10L; wherein the monitored second sub-lighting current I2-1b of the lighting element 20 in the b-th row is equal to the preset second sub-lighting current I₀2-1 difference is understood to mean that the difference is large and far beyond the tolerance of the measurement error.

S264: thus, the coordinates [ a, b ] of the display dead pixel, that is, the intersection limit position of the a-th pixel driving circuit row 10H0 and the b-th pixel driving circuit column 10L0 in the area coordinates [ i, j ] of the display dead pixel, are obtained, and the position coordinate of one display dead pixel 1 as illustrated in fig. 15 is [2,3] in the area coordinates [ i, j ] of the display dead pixel.

The method for determining the position of the dead pixel displayed by the light emitting element 20 in the display panel 000 of the embodiment can improve the detection efficiency, and can accurately determine the specific position of the dead pixel displayed by the current comparison method, thereby being beneficial to improving the detection precision.

Optionally, with continuing to refer to fig. 1-7, fig. 15-18 and fig. 19, in this embodiment, if the monitored first sub-light-emitting current I1-1a of the lighting element 20 in the a-th row is greater than the preset first sub-light-emitting currentI₀1-1, and/or the monitored second sub-emission current I2-1b of the light-emitting element 20 of the b-th column is greater than the preset second sub-emission current I₀2-1, displaying that the dead pixel is a bright point;

if the monitored first sub-light-emitting current I1-1a of the lighting element 20 in the a-th row is smaller than the preset first sub-light-emitting current I₀1-1, and/or the monitored second sub-emission current I2-1b of the light-emitting element 20 of the b-th column is less than the preset second sub-emission current I₀2-1, the dead pixel is a dark pixel.

This embodiment further explains that after determining the position of the display dead pixel in the display panel 000 to be detected, the size of the abnormal current value may be analyzed to obtain whether the property of the display dead pixel is a dark dot or a bright dot, and the analysis method may be: if the area coordinate [ i, j ] of the display dead pixel is monitored]The first sub light emitting current I1-1a of the a-th pixel driving circuit row 10H0 is greater than the preset first sub light emitting current I₀1-1, and/or the monitored second sub-emission current I2-1b of the b-th pixel driving circuit column 10L0 is greater than the preset second sub-emission current I₀2-1, the dead spot is a bright spot. If the area coordinate [ i, j ] of the display dead pixel is monitored]The first sub-emitting current I1-1a of the a-th row light emitting element 20 in (1) is smaller than the preset first sub-emitting current I₀1-1, and/or the monitored second sub-emission current I2-1b of the light-emitting element 20 of the b-th column is less than the preset second sub-emission current I₀2-1, the dead pixel is a dark pixel, and as shown in fig. 15, 17 and 18, the first sub-emitting current I1-12 of the dead pixel 1 is smaller than the preset first sub-emitting current I₀1-1, the second sub-light-emitting current I2-13 of the dead pixel 1 is smaller than the preset second sub-light-emitting current I₀2-1, the type of the dead pixel 1 can be determined to be a dark pixel. In the embodiment, the relationship between the abnormal current value and the preset standard current value is analyzed and compared, so that the type of the dead pixel displayed in the display panel 000 can be accurately obtained, the detection mode is simple and rapid, and the detection accuracy is high.

In some optional embodiments, please refer to fig. 20, fig. 20 is a partition structure diagram of a display panel corresponding to another detection method provided in the embodiment of the present invention, in the detection method in this embodiment, on the basis of dividing a display panel 000 to be detected into a plurality of region blocks BL, each region block BL is lighted, the light emitting current of the light emitting element 20 in each different region block BL is detected by the current detection device, optionally, the light emitting current of the light emitting element 20 in one region block BL detected is the sum of the light emitting currents of the light emitting elements 20 in the region, then, the current monitoring result after the sum is subjected to dead pixel determination, if the detected current value of one or some region blocks BL is different from the current values of other region blocks BL, or the detected current value of one or some region blocks BL is different from the standard current value, determining that a display dead pixel exists in the area block BL; then, a smaller block can be independently lighted in the area block BL where the display dead pixel is located, or a light emitting element of a single pixel driving circuit in the area block BL where the display dead pixel is located is lighted, so as to perform specific positioning of the display dead pixel. In this embodiment, a detection method for performing region block division and detection analysis on the current value of the display panel 000 to be detected is adopted, so that the display panel can be quickly converged to the position where the dead pixel is displayed, the detection time can be further shortened, and the detection efficiency can be improved.

In some optional embodiments, please refer to fig. 21, where fig. 21 is a partition structure diagram of a display panel corresponding to another detection method provided in an embodiment of the present invention, in this embodiment, a display panel 000 to be detected includes: a plurality of pixel driving circuits 10 arranged in an array, the display panel 000 further includes a plurality of light emitting elements 20, and the light emitting elements 20 correspond to and are electrically connected to the pixel driving circuits 10; wherein the plurality of pixel driving circuits 10 arranged in sequence along the first direction X form a pixel driving circuit row 10H0, the plurality of pixel driving circuit rows 10H0 are arranged in sequence along the second direction Y, the plurality of pixel driving circuits 10 arranged in sequence along the second direction Y form a pixel driving circuit column 10L0, the plurality of pixel driving circuit columns 10L0 are arranged in sequence along the first direction X, and the first direction X intersects the second direction Y;

and along the first direction X, the display panel 000 includes a middle region 001 and edge regions 002 located at opposite sides of the middle region 001; one pixel driving circuit column group 10L of the middle region 001 includes n1 column pixel driving circuits 10, and one pixel driving circuit column group 10L of the edge region 002 includes n2 column pixel driving circuits 10, where n1 < n 2.

In this embodiment, it is explained that when n pixel driving circuit columns 10L0 are one pixel driving circuit column group 10L, one pixel driving circuit column group 10L located in the middle area 001 of the display panel 000 in the first direction X includes n1 columns of pixel driving circuits 10, and one pixel driving circuit column group 10L located in the edge area 002 of the display panel 000 in the first direction X includes n2 columns of pixel driving circuits 10, where n1 < n2, as illustrated in fig. 21, where n1 is 2 and n2 is 4, that is, one pixel driving circuit column group 10L in the middle area 001 includes a smaller number of pixel driving circuit columns 10L0, and one pixel driving circuit column group 10L in the edge area 002 includes a larger number of pixel driving circuit columns 10L 0. Because the judgment standard for displaying the dead pixel in the display panel industry is related to the display area of the display panel 000, the measurement of different densities can be performed by controlling the number of columns of the pixel driving circuit column 10L0 when one pixel driving circuit column group 10L is lighted in the detection process, specifically, relatively dense detection is adopted in the central display area, namely the middle area 001 of the display panel 000, namely the lighted pixel driving circuit column group 10L is relatively thin each time, relatively sparse detection is adopted in the edge display area, namely the edge area 002 of the display panel 000, namely the lighted pixel driving circuit column group 10L is relatively thick each time, so that the detection time can be compressed to a certain extent, and the detection accuracy can be ensured as much as possible.

It can be understood that, in the present technical field, the number of dead pixels displayed in the central display area and the edge display area may be different, so the number of columns of the pixel driving circuit column 10L0 included in the pixel driving circuit column group 10L sampled in the detection process may be changed according to actual situations, the specific coverage areas of the middle area 001 and the edge area 002 are not specifically limited in this embodiment, and the specification requirement and efficiency of the product may be balanced in actual use to determine the middle area 001 and the edge area 002, which is not limited in this embodiment.

Optionally, as shown in fig. 22, fig. 22 is a dividing structure diagram of a display panel corresponding to another detection method provided in the embodiment of the present invention, in this embodiment, along a first direction X, a display panel 000 includes a middle region 001 and edge regions 002 located at two opposite sides of the middle region 001; one pixel driving circuit column group 10L of the middle region 001 includes n1 column pixel driving circuits 10, and one pixel driving circuit column group 10L of the edge region 002 includes n2 column pixel driving circuits 10, where n1 < n2, and n1 is 1.

In this embodiment, it is further explained that when n pixel driving circuit columns 10L0 are one pixel driving circuit column group 10L, one pixel driving circuit column group 10L located in the middle area 001 of the display panel 000 in the first direction X includes 1 column of pixel driving circuits 10, and one pixel driving circuit column group 10L located in the edge area 002 of the display panel 000 in the first direction X includes n2 columns of pixel driving circuits 10, where n2 is a positive integer greater than 1, as shown in fig. 22, n1 is 1, and n2 is 4, that is, one pixel driving circuit column group 10L in the middle area 001 includes only one pixel driving circuit column 10L0, and one pixel driving circuit column group 10L in the edge area 002 includes two or more pixel driving circuit columns 10L 0. Because the judgment standard for displaying the dead pixel in the display panel industry is related to the display area of the display panel 000, the measurement of different densities can be performed by controlling the number of columns of the pixel driving circuit columns 10L0 when one pixel driving circuit column group 10L is lighted in the detection process, specifically, the central display area of the display panel 000, that is, the middle area 001, adopts the lighting detection of one dense column, and the edge display area of the display panel 000, that is, the edge area 002, adopts the sparse detection, that is, the number of the pixel driving circuit columns 10L0 included in the thicker pixel driving circuit column group 10L lighted each time is large, so that the detection time can be compressed to a certain extent, the detection accuracy of the middle area 001 can be ensured as much as possible, and the middle display area of the detected display panel 000 has a good display effect, the user satisfaction is improved.

In some optional embodiments, please continue to refer to fig. 1 to fig. 22 in combination, in the embodiment, the maximum light-emitting brightness of the light-emitting element 20 in the display panel 000 to be detected is a nit, and the minimum light-emitting brightness of the light-emitting element in the display panel 000 to be detected is B nit, so that in the process of implementing the detection method of the embodiment, i.e., in the process of lighting the light-emitting element 20 for current monitoring, the brightness range of the light-emitting element 20 to be lit is a range of brightness

This embodiment explains that in the process of detecting a display dead pixel, the light emission luminance of the lighted light emitting element 20 may be between the maximum light emission luminance a nit and the minimum light emission luminance B nit of the light emitting element 20 itself, and the luminance range of the light emitting element 20 which can be optionally lighted is

Further alternatively, the brightness of the illuminated light emitting elements 20 may be approximately equal to

Because the tolerance of the display panel 000 for the bright point and the dark point is different when the display brightness is graded, the brightness of the light-emitting element 20 is set to be located at the middle part of the maximum brightness and the minimum brightness when the dead point is detected, that is, if the light-emitting current of the light-emitting element 20 corresponding to the display dead point is greater than the preset standard current during the detection, the light-emitting brightness of the light-emitting element 20 is obviously greater than C, and the display dead point can be determined to be the bright point; if the light emitting current of the light emitting element 20 corresponding to the display dead pixel is smaller than the preset standard current during the detection, it is shown that the light emitting brightness of the light emitting element 20 is obviously smaller than C, and the display dead pixel can be determined to be a dark pixel. Optionally, the luminance of the light emitting device 20 may also be represented by a gray scale, for example, if the maximum value of the luminance gray scale in an 8-bit display panel (a display panel capable of distinguishing 2-power gray scale) is 255 gray scale, and the minimum value is 0 gray scale, the gray scale adopted by the light emitting device 20 during detection is 255 gray scaleThe gray level may be 127, which is equivalent to the middle value between the gray levels of 0-255, so that during the detection, if the current corresponding to the gray level of 127 is the standard current value, if the detected current for displaying the dead pixel is too large compared with the standard current value, the dead pixel is the bright-dot dead pixel, and if the detected current for displaying the dead pixel is too small compared with the standard current value, the dead pixel is the dark-dot dead pixel. In the embodiment, the luminance of the light emitting element 20 during the detection is set in the middle area between the maximum luminance a nit and the minimum luminance B nit of the light emitting element 20, so that the types of the dead pixels can be better distinguished, and the detection accuracy and the detection effect of the display panel can be improved.

In some alternative embodiments, please continue to refer to fig. 1 to fig. 22 in combination, the sampling time of the detection method for setting the display panel 000 in the present embodiment is greater than or equal to one frame time.

The embodiment explains that the sampling time of the detection method provided can be greater than or equal to one frame time, and assuming that there is no display dead pixel in the display panel 000 to be detected, the detection result can be obtained most quickly after scanning for one frame time, that is, after scanning for one frame time at least, by comparing each of the first light emitting currents I1(I11, I12, I13 … … I1k) and each of the second light emitting currents I2(I21, I22, I23 … … I2p), if there is no current abnormality, it is determined that there is no display dead pixel in the light emitting element 20 in the display panel 000. Here, one frame time refers to a time required to scan all the pixel driving circuit lines in the display panel 000 once. Optionally, in order to further improve the detection accuracy, the time for detecting and sampling may be increased, and if no current abnormality is found after scanning for multiple frames, it may be determined more accurately that there is no display dead pixel in the light emitting element 20 in the display panel 000. Or if a display panel 000 to be detected has a display dead pixel, the display dead pixel in the display panel 000 and the area or the position where the display dead pixel exists can be determined more accurately by comparing each first light-emitting current I1(I11, I12, I13 … … I1k) with each second light-emitting current I2(I21, I22, I23 … … I2p) after scanning for multiple frames, so that a detection error caused by instability of current data only sampled for one frame of time can be avoided, and detection accuracy can be improved better.

In some optional embodiments, please refer to fig. 23, fig. 23 is a schematic plan view illustrating another structure of a display panel to be detected according to an embodiment of the present invention, in which the display panel 000 provided in this embodiment performs display dead pixel detection by using the detection method in the above embodiment;

the display panel 000 includes a display area AA and a non-display area NA disposed around the display area AA, the non-display area NA including a binding area BA;

the monitor terminal test of the light emitting current of the light emitting element 20 is located in the bonding area BA.

The embodiment explains that a general display panel 000 to be detected includes a display area AA and a non-display area NA arranged around the display area AA, where the non-display area NA includes a bonding area BA, and the bonding area BA is used for bonding a driving chip and/or a flexible circuit board, and since the bonding area BA does not need to be provided with a pixel driving circuit 10 and a light emitting element 20, and has a larger space to be provided with a monitoring terminal test of a light emitting current, the monitoring terminal test of the light emitting current of the light emitting element 20 connected to a current detection device (such as a current meter a) can be arranged in the bonding area BA, and a dead pixel detection effect can be realized while a display effect is not affected.

Optionally, referring to fig. 24, fig. 24 is another schematic plane structure diagram of the display panel to be detected according to the embodiment of the present invention, the non-display area NA of the display panel 000 may further include a first non-display area NA1 and a second non-display area NA2 located on two opposite sides of the display area AA in the first direction X, and the first non-display area NA1 and the second non-display area NA2 may be used to configure a scan driving circuit connected to the pixel driving circuit 10. The monitoring terminal test of the light emitting current of the light emitting element 20 connected to the current detection device in this embodiment may be disposed in the first non-display area NA1 or the second non-display area NA2, so that the connection distance between the monitoring terminal test (detection point) of the light emitting current and the light emitting element 20 (detected object) may be reduced, and further, the internal resistance caused by the monitoring terminal test of the light emitting current may be reduced, thereby further reducing the detection error and improving the detection accuracy.

It should be noted that, in this embodiment, the setting position of the monitoring terminal test of the light emitting current of the light emitting element 20 connected to the current detection device is not specifically limited, and in the specific implementation, the setting may be performed according to the actual space and the detection requirement of the display panel 000, and only the display effect and the detection effect of the display panel itself need not be affected.

According to the embodiment, the detection method of the display panel and the display panel provided by the invention at least realize the following beneficial effects:

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present 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 method for detecting a display panel, the display panel comprising: the display panel also comprises a plurality of light-emitting elements, and the light-emitting elements correspond to and are electrically connected with the pixel driving circuit; the pixel driving circuits sequentially arranged along a first direction form a pixel driving circuit row, the pixel driving circuit rows are sequentially arranged along a second direction, the pixel driving circuits sequentially arranged along the second direction form a pixel driving circuit column, the pixel driving circuit columns are sequentially arranged along the first direction, and the first direction and the second direction are intersected;

m pixel driving circuit rows are arranged in a pixel driving circuit row group, and n pixel driving circuit rows are arranged in a pixel driving circuit column group; wherein m and n are positive integers;

the detection method comprises the following steps:

sequentially lighting the light-emitting elements corresponding to each pixel driving circuit row group, and monitoring a first light-emitting current of the light-emitting elements of each pixel driving circuit row group;

sequentially lighting the light-emitting element corresponding to each pixel driving circuit column group, and monitoring a second light-emitting current of the light-emitting element of each pixel driving circuit column group;

and judging whether the light-emitting elements in the display panel have display dead pixels or not by comparing each first light-emitting current with each second light-emitting current.

2. The method for detecting a display panel according to claim 1, wherein the determining whether or not there is a display dead pixel in the light emitting element in the display panel includes:

comparing each monitored first luminous current with a preset first luminous current,

comparing each monitored second light-emitting current with a preset second light-emitting current;

if the monitored first luminous current of the ith pixel driving circuit row group is different from the preset first luminous current, positioning that a display dead pixel exists in the ith pixel driving circuit row group of the display panel;

if the monitored second light-emitting current of the jth pixel driving circuit column group is different from the preset second light-emitting current, positioning that a display dead pixel exists in the jth pixel driving circuit column group of the display panel;

thereby obtaining region coordinates [ i, j ] showing a dead pixel.

3. The method according to claim 2, wherein m is 1 and n is 1, and the coordinates of the displayed dead pixel are the coordinates [ i, j ] of the area where the dead pixel is displayed.

4. The detection method of a display panel according to claim 3,

if the monitored first luminous current of the ith pixel driving circuit row group is greater than the preset first luminous current and/or the monitored second luminous current of the jth pixel driving circuit column group is greater than the preset second luminous current, the display dead pixel is a bright point;

and if the monitored first luminous current of the ith pixel driving circuit row group is smaller than the preset first luminous current and/or the monitored second luminous current of the jth pixel driving circuit column group is smaller than the preset second luminous current, the display dead pixel is a dark dot.

5. The method for inspecting a display panel according to claim 2, wherein m is 2 or more and n is 2 or more.

6. The detection method of a display panel according to claim 5,

the detection method further comprises the following steps:

according to the area coordinates [ i, j ] of the display dead pixel;

sequentially lighting each row of light-emitting elements in the ith pixel driving circuit row group along the second direction, and monitoring a first sub-light-emitting current of each row of light-emitting elements in the ith pixel driving circuit row group;

sequentially lighting each row of light-emitting elements in the jth pixel driving circuit column group along the first direction, and monitoring a second sub-light-emitting current of each row of light-emitting elements in the jth pixel driving circuit column group;

and determining the coordinates of the display dead pixel in the area coordinates [ i, j ] of the display dead pixel by comparing each of the first sub-light-emitting current and the second sub-light-emitting current.

7. The method for detecting a display panel according to claim 6, wherein the method for determining the coordinates of the display dead pixel in the area coordinates [ i, j ] of the display dead pixel comprises:

comparing each monitored first sub-luminous current with a preset first sub-luminous current,

comparing each monitored second sub-luminous current with a preset second sub-luminous current;

if the monitored first sub-luminous current of the luminous element of the a-th row is different from the preset first sub-luminous current, determining that the luminous element of the a-th row of the display panel has a display dead pixel, wherein a pixel driving circuit corresponding to the luminous element of the a-th row is positioned in the ith pixel driving circuit row group;

if the monitored second sub-light-emitting current of the light-emitting element in the b-th row is different from the preset second sub-light-emitting current, determining that a display dead pixel exists in the light-emitting element in the b-th row of the display panel, wherein a pixel driving circuit corresponding to the light-emitting element in the b-th row is located in the jth pixel driving circuit column group;

thereby obtaining coordinates [ a, b ] showing the dead pixel.

8. The detection method of a display panel according to claim 7,

if the monitored first sub-light-emitting current of the light-emitting element in the a-th row is greater than the preset first sub-light-emitting current and/or the monitored second sub-light-emitting current of the light-emitting element in the b-th column is greater than the preset second sub-light-emitting current, the display dead pixel is a bright point;

and if the monitored first sub-luminous current of the luminous element in the a-th row is smaller than the preset first sub-luminous current and/or the monitored second sub-luminous current of the luminous element in the b-th row is smaller than the preset second sub-luminous current, the display dead pixel is a dark pixel.

9. The method for inspecting a display panel according to claim 1, wherein the display panel includes a middle region and edge regions on opposite sides of the middle region in the first direction;

one of the pixel driving circuit column groups in the middle region includes n1 column pixel driving circuits, and one of the pixel driving circuit column groups in the edge region includes n2 column pixel driving circuits, where n1 < n 2.

10. The method for inspecting a display panel according to claim 9, wherein n1 is 1.

11. The method as claimed in claim 1, wherein the maximum luminance of the light emitting devices in the display panel is A nit, the minimum luminance of the light emitting devices in the display panel is B nit, the luminance range of the light emitting devices lighted during the monitoring process is C,

12. the method according to claim 1, wherein the pixel driving circuit comprises a first power voltage signal terminal for providing a first power voltage signal to the light emitting element;

and the monitoring end of the luminous current is connected with the first power supply voltage signal end.

13. The method for detecting the display panel according to claim 12, wherein a monitoring end of the light emitting current is connected to any one of a current meter and an oscilloscope.

14. The method of claim 1, wherein a sampling time of the method is greater than or equal to one frame time.

15. A display panel, wherein the display panel performs display dead pixel detection by using the detection method according to any one of claims 1 to 13;

the display panel comprises a display area and a non-display area arranged around the display area, wherein the non-display area comprises a binding area;

and the monitoring end of the luminous current of the luminous element is positioned in the binding region.