CN209878910U - Detection circuit of display panel - Google Patents

Abstract

A detection circuit of a display panel, comprising: a first port set including a first port and a second port, a second port set including a third port and a fourth port for a Cartridge Test (CT) monochrome picture test; wherein, the first port is connected with the first region of distributing conventional data signal line, and the fourth port is connected with the second region of distributing conventional data signal line, still includes: a fifth port for Panel Crack Detection (PCD) detection combined with the second port, the fifth port connected with a third region between the first port and the second port except for a PCD winding region; a sixth port for PCD detection combined with the fourth port; the sixth port is connected with a fourth area except the PCD winding area between the third port and the fourth port; wherein, the intersection of the third area and the first area is empty; the intersection of the fourth area and the second area is empty. The embodiment of the utility model provides a circuit design who carries out CT monochromatic picture detection and PCD detection simultaneously has been realized under the limited condition in space.

Description

Detection circuit of display panel

Technical Field

The present disclosure relates to, but not limited to, process inspection technologies, and more particularly, to a circuit for inspecting a display panel.

Background

Active Matrix Organic Light Emitting Diodes (AMOLEDs) are becoming the trend of future displays due to their advantages of wide color gamut, thinness, high contrast, and self-luminescence. The general processes of the AMOLED include an Array (Array) preparation process, a light emitting material evaporation process, a Cell cutting process, and a module process. The Cell Test (CT) is performed after the Cell cutting process, and then, the Panel Crack Detection (PCD) and the CT monochromatic picture detection (also called RGBW monochromatic picture detection, RGBW is a four-color pixel design in which a W white sub-pixel is added to the original RGB three primary colors) (hereinafter, the RGBW monochromatic picture detection is referred to as monochromatic picture detection for short) are performed to determine the grade of the product.

FIG. 1 is a schematic diagram illustrating a detection circuit for detecting a display panel in the related art, as shown in FIG. 1, a PCD detection line 1-1, a Normal data line 1-2, and a PCD winding line 1-3 are connected to the display panel, the detection circuit includes two CT units, namely, a first CT unit 1-, a second CT unit 4, and a second CT unit 1-5, the first CT unit and the second CT unit are respectively connected to the display panel through a first Pad (Pad)1-6, a second Pad1-7, a third Pad1-8, and a fourth Pad1-9, and are respectively used for PCD detection and CT monochrome picture detection. The two units are independently detected without mutual influence, and do not pass through PCD winding when the second CT unit carries out CT monochromatic picture test, so that large loading (loading) can not be caused, and the panel display is uniform. In a product with a tense lower frame, due to space limitation, a set of CT units are commonly used for PCD and CT monochromatic picture detection; FIG. 2 is a schematic diagram of another detection circuit for detecting a display panel in the related art, as shown in FIG. 2, the detection circuit performs normal operation of the PCD detection circuit, and if a crack or degradation (crack) occurs at an edge, the PCD detection lines (several detection lines of dotted lines in FIG. 2) are illuminated under a black frame, so as to determine the crack; however, when CT monochrome picture detection is performed, if a pure green picture is detected, corresponding signals are provided to the first pad and the fourth pad at the same time, a normal data (normal data) signal line is normally lit, and the middle PCD test line enters a normal display area only through the adjacent PCD winding, so that large loading (loading) is caused and a different display picture appears. Fig. 3 is a schematic diagram of an abnormally displayed picture in the related art, and referring to fig. 3, the abnormally displayed picture shows bright lines (vertical lines are exemplary bright lines) in addition to the test colors (the left oblique lines indicate the normally displayed picture), which affect the grade judgment of the product in the CT stage. Therefore, the technical personnel delete the PCD detection in the CT stage, and the detection circuit only carries out CT monochrome picture detection; namely, the PCD Detection needs to be performed in a Method Detectable Limit (MDL) phase, so the CT phase can perform CT monochrome picture Detection, but cannot perform PCD Detection.

In summary, the detection circuit of the current display panel cannot perform PCD detection simultaneously when performing CT monochrome picture detection, which affects the detection efficiency of the display panel.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a display panel's detection circuitry can promote display panel's detection efficiency.

The embodiment of the utility model provides a display panel's detection circuitry, include: : the first port group comprises a first port and a second port, and the second port group comprises a third port and a fourth port; wherein, the first port is connected with the first region of distributing conventional data signal line, and the fourth port is connected with the second region of distributing conventional data signal line, its characterized in that still includes:

a fifth port for panel crack detection PCD combined with the second port, the fifth port connected to a third region between the first port and the second port except for a PCD winding region;

a sixth port for PCD detection combined with the fourth port; the sixth port is connected with a fourth area except the PCD winding area between the third port and the fourth port;

wherein the intersection of the third region and the first region is empty; the intersection of the fourth region and the second region is empty.

In an exemplary embodiment, the third region and the first region include: the PCD winding area is distributed on two sides of the PCD winding area and is not adjacent to the PCD winding area.

In an exemplary embodiment, the fourth region and the second region include: the PCD winding area is distributed on two sides of the PCD winding area and is not adjacent to the PCD winding area.

In an exemplary embodiment, the fifth port is connected to a first signal output device that sends the same PCD detection signal to the second port when PCD detection is performed.

In an exemplary embodiment, the sixth port is connected to a second signal output device that sends the same PCD test signal to the third port when PCD testing is performed.

In an exemplary embodiment, the fifth port is connected to a third signal output device that sends a PCD detection signal to the second port when PCD detection is performed.

In an exemplary embodiment, the sixth port is connected to a fourth signal output device for sending a PCD detection signal to the fourth port when PCD detection is performed.

In an exemplary embodiment, when PCD detection is performed, the fifth port, the sixth port, the second port and the third port are all connected with the same fifth signal output device which sends PCD detection signals.

In one exemplary embodiment of the present invention,

the fifth port comprises a fifth PAD PAD which is connected with a line before PCD detection;

the sixth port comprises a sixth PAD PAD which is connected with a line before PCD detection;

wherein the fifth PAD and the sixth PAD are at the same level.

In an exemplary embodiment, the fifth PAD is at the same level as a PAD of any one of the following ports:

a first port, a second port, a third port, and a fourth port.

Compared with the related art, the technical scheme of the application comprises the following steps: the first port group comprises a first port and a second port, and the second port group comprises a third port and a fourth port; wherein, the first port is connected with the first region of distributing conventional data signal line, and the fourth port is connected with the second region of distributing conventional data signal line, still includes: a fifth port for panel crack detection PCD combined with the second port, the fifth port connected to a third region between the first port and the second port except for a PCD winding region; a sixth port for PCD detection combined with the fourth port; the sixth port is connected with a fourth area except the PCD winding area between the third port and the fourth port; wherein, the intersection of the third area and the first area is empty; the intersection of the fourth area and the second area is empty. The embodiment of the utility model provides a circuit design who carries out CT monochromatic picture detection and PCD detection simultaneously has been realized under the limited condition in space, has promoted display panel's detection efficiency.

The embodiment of the utility model provides a display panel's detection circuitry's communication quality has been promoted. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.

FIG. 1 is a schematic diagram illustrating a detection circuit for detecting a display panel according to the related art;

FIG. 2 is a diagram illustrating another related art detecting circuit for detecting a display panel;

FIG. 3 is a diagram illustrating an abnormal display screen according to the related art;

fig. 4 is a block diagram of a detection circuit of a display panel according to an embodiment of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

Fig. 4 is a block diagram of a detection circuit of a display panel according to an embodiment of the present invention, as shown in fig. 4, including: a first port group including a first port 4-1 and a second port 4-2, a second port group including a third port 4-3 and a fourth port 4-4 for a Cassette Test (CT) monochrome picture test; the first port 4-1 is connected with a first area of a distributed Normal data (Normal data) signal line 1-2, and the fourth port 4-4 is connected with a second area of the distributed Normal data signal line 1-2; the detection circuit further includes:

a fifth port 4-6 for Panel Crack Detection (PCD) detection combined with the second port 4-2, the fifth port 4-5 being connected to a third region between the first port 4-1 and the second port 4-2 except for a region of the PCD winding 1-3;

a sixth port 4-6 for PCD detection in combination with the fourth port 4-4; the sixth port 4-6 is connected with a fourth area between the third port 4-3 and the fourth port 4-4 except the area of the PCD winding wire 1-3;

wherein the intersection of the third region and the first region is empty; the intersection of the fourth region and the second region is empty.

It should be noted that, according to the above statements, the first port group and the second port group are both used for CT monochrome picture test, the first port is connected to the first region where the conventional data signal lines are distributed, and the fourth port is connected to the second region where the conventional data signal lines are distributed; with the combination of related theories, a person skilled in the art can determine that the position of the second port and the third port connected with the display panel is a position close to the region where the PCD detection lines are distributed, the PCD detection lines and the Normal data signal lines are distributed at two ends of the PCD winding region, namely, one side region of the PCD winding region, and the first port and the fourth port are connected through pins and wiring; and the other side area of the PCD winding is connected with the second port and the third port through pins and wiring.

In an exemplary embodiment, the third region and the first region include: the PCD winding area is distributed on two sides of the PCD winding area and is not adjacent to the PCD winding area.

In an exemplary embodiment, the fourth region and the second region include: the PCD winding area is distributed on two sides of the PCD winding area and is not adjacent to the PCD winding area.

In an exemplary embodiment, the fifth port is connected to a first signal output device that sends the same PCD detection signal to the second port when PCD detection is performed.

In an exemplary embodiment, the sixth port is connected to a second signal output device that sends the same PCD test signal to the third port when PCD testing is performed.

In an exemplary embodiment, the fifth port is connected to a third signal output device that sends a PCD detection signal to the second port when PCD detection is performed.

In an exemplary embodiment, the sixth port is connected to a fourth signal output device for sending a PCD detection signal to the fourth port when PCD detection is performed.

In an exemplary embodiment, when PCD detection is performed, the fifth port, the sixth port, the second port and the third port are all connected with the same fifth signal output device which sends PCD detection signals.

In one exemplary embodiment, the fifth port comprises a fifth PAD wired before PCD test; the sixth port comprises a sixth PAD PAD which is connected with a line before PCD detection;

wherein the fifth PAD and the sixth PAD are at the same level.

In an exemplary embodiment, the fifth PAD is at the same level as a PAD of any one of the following ports: a first port, a second port, a third port, and a fourth port.

The pad of the newly added port can be arranged together with the pad of the port of the conventional CT test, and during wiring, wiring to PCD winding can be avoided, so that the difference of loading signals of data lines entering a display area is caused, and a lighting picture is normal.

According to the embodiment of the invention, the fifth port and the sixth port are newly added on two sides of the panel accessed to the PCD, and after the detection circuit is connected through the lead, the detection circuit can simultaneously realize PCD detection and CT monochromatic picture test; when CT monochromatic image testing is carried out, the same testing signals are simultaneously accessed to the fifth port, the first port, the fourth port and the sixth port, and the situation that a middle data line passes through PCD winding wires on two sides of the display panel is avoided, so that resistance difference is reduced, image display is uniform, and abnormal display of bright lines is avoided. The test signals in the embodiments of the present invention are the same as those used for testing in the related art, and are not described herein again. The following is a brief description of the detection contents of the detection circuit

In the CT stage, when PCD detection is carried out, only the first port and the fourth port (DG) are required to simultaneously send the same detection signals for PCD detection, and PCD detection can be realized;

in the CT stage, the monochromatic picture detection is performed by CT, and the monochromatic picture detection can be realized by giving the same detection signals for performing the monochromatic picture detection to the fifth port, the first port, the fourth port and the sixth port;

and in the MDL stage, when the PCD is detected, the second port and the third port are driven by the integrated circuit, and the PCD can be detected by the resistance test of the conduction loop.

According to the scheme, in the CT stage, when the PCD detection and the CT monochromatic picture detection share the same CT unit, the PCD detection and the CT monochromatic picture detection can be respectively carried out by adding two ports, the PCD detection is completed by one set of CT unit, and the detection efficiency is improved.

Compared with the related art, the technical scheme of the application comprises the following steps: the first port group comprises a first port and a second port, and the second port group comprises a third port and a fourth port; wherein, the first port is connected with the first region of distributing conventional data signal line, and the fourth port is connected with the second region of distributing conventional data signal line, still includes: a fifth port for panel crack detection PCD combined with the second port, the fifth port connected to a third region between the first port and the second port except for a PCD winding region; a sixth port for PCD detection combined with the fourth port; the sixth port is connected with a fourth area except the PCD winding area between the third port and the fourth port; wherein, the intersection of the third area and the first area is empty; the intersection of the fourth area and the second area is empty. The embodiment of the utility model provides a circuit design who carries out CT monochromatic picture detection and PCD detection simultaneously has been realized under the limited condition in space, has promoted display panel's detection efficiency.

It will be understood by those skilled in the art that all or part of the steps of the above method may be implemented by a program instructing associated hardware (e.g., noise reduction circuit), and the program may be stored in a computer-readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in a form of hardware, for example, by an integrated circuit to implement its corresponding function, or may be implemented in a form of a software functional module, for example, by a noise reduction circuit to execute a program/instruction stored in a memory to implement its corresponding function. The present invention is not limited to any specific form of hardware or software combination.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A detection circuit of a display panel, comprising: the first port group comprises a first port and a second port, and the second port group comprises a third port and a fourth port; wherein, the first port is connected with the first region of distributing conventional data signal line, and the fourth port is connected with the second region of distributing conventional data signal line, its characterized in that still includes:

a fifth port for panel crack detection PCD combined with the second port, the fifth port connected to a third region between the first port and the second port except for a PCD winding region;

a sixth port for PCD detection combined with the fourth port; the sixth port is connected with a fourth area except the PCD winding area between the third port and the fourth port;

wherein the intersection of the third region and the first region is empty; the intersection of the fourth region and the second region is empty.

2. The detection circuit of claim 1,

the third region and the first region include: the PCD winding area is distributed on two sides of the PCD winding area and is not adjacent to the PCD winding area.

3. The detection circuit of claim 1,

the fourth region and the second region include: the PCD winding area is distributed on two sides of the PCD winding area and is not adjacent to the PCD winding area.

4. The detection circuit according to any one of claims 1 to 3,

when PCD detection is carried out, the fifth port is connected with a first signal output device which sends the same PCD detection signal to the second port.

5. The detection circuit according to any one of claims 1 to 3,

when PCD detection is performed, the sixth port is connected to a second signal output device that sends the same PCD detection signal to the third port.

6. The detection circuit according to any one of claims 1 to 3,

when PCD detection is carried out, the fifth port is connected with a third signal output device which sends PCD detection signals to the second port.

7. The detection circuit according to any one of claims 1 to 3,

when the PCD detection is carried out, the sixth port is connected with a fourth signal output device which sends a PCD detection signal to the fourth port.

8. The detection circuit according to any one of claims 1 to 3,

when PCD detection is carried out, the fifth port, the sixth port, the second port and the third port are all connected with the same fifth signal output device which sends PCD detection signals.

9. The detection circuit according to any one of claims 1 to 3,

the fifth port comprises a fifth PAD PAD which is connected with a line before PCD detection;

the sixth port comprises a sixth PAD PAD which is connected with a line before PCD detection;

wherein the fifth PAD and the sixth PAD are at the same level.

10. The detection circuit of claim 9, wherein the fifth PAD is at the same level as a PAD of any one of the following ports:

a first port, a second port, a third port, and a fourth port.