CN111508401A - Crack detection circuit, display panel and crack detection method - Google Patents
Crack detection circuit, display panel and crack detection method Download PDFInfo
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- CN111508401A CN111508401A CN202010536325.7A CN202010536325A CN111508401A CN 111508401 A CN111508401 A CN 111508401A CN 202010536325 A CN202010536325 A CN 202010536325A CN 111508401 A CN111508401 A CN 111508401A
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- display panel
- crack detection
- resistance line
- resistance
- detection circuit
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- Physics & Mathematics (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The application discloses crack detection circuit, display panel and crack detection method, crack detection circuit, including setting up first resistance line and the second resistance line on display panel, the second resistance line is followed display panel circumference sets up, first resistance line with the second resistance line is established ties to be connected to display panel driver chip, the tie point between first resistance line and the second resistance line is the crack detection point. According to the technical scheme provided by the embodiment of the application, the first resistance wire and the second resistance wire are arranged on the display panel, so that the first resistance wire and the second resistance wire are prepared in the panel preparation process, the two resistance wires are prepared by the same process, the generated differences are equivalent, and the misjudgment phenomenon caused by different resistance preparation processes is avoided in the display panel crack detection process.
Description
Technical Field
The present invention relates generally to the field of display, and more particularly to a crack detection circuit, a display panel, and a crack detection method.
Background
In the field of AMO L ED, PCD (Panel Crack Detection) is indispensable as a function for detecting screen damage, however, at the present stage, the problems of production line production process differences exist, namely, in the production process, the PCD function misjudgment is caused by the difference between the drive chip and the Panel production process, and the production line production yield is reduced because the resistance value in the drive chip production process and the resistance value in the Panel production process have deviation.
Disclosure of Invention
In view of the above-mentioned drawbacks or deficiencies in the prior art, it is desirable to provide a crack detection circuit, a display panel, and a crack detection method.
In a first aspect, a crack detection circuit is provided, including a first resistance line and a second resistance line disposed on a display panel, the second resistance line being disposed along a circumferential direction of the display panel,
the first resistance line and the second resistance line are connected in series and connected to a display panel driving chip, and a connection point between the first resistance line and the second resistance line is a crack detection point.
In a second aspect, a display panel is provided, comprising the crack detection circuit described above.
In a third aspect, a crack detection method for a display panel is provided, which uses the crack detection circuit for detection.
According to the technical scheme provided by the embodiment of the application, the first resistance wire and the second resistance wire are arranged on the display panel, so that the first resistance wire and the second resistance wire are both prepared in the panel preparation process, the two resistance wires are prepared by the same process, the generated resistance difference is the same or similar, and the misjudgment phenomenon caused by different resistance preparation processes is avoided in the display panel crack detection process.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a display panel including a crack detection circuit according to this embodiment.
Fig. 2 is a schematic diagram of a crack detection circuit in this embodiment.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the present embodiment provides a crack detection circuit, which includes a first resistance line 1 and a second resistance line 2 disposed on a display panel 4, wherein the second resistance line 2 is disposed along a circumferential direction of the display panel 4,
the first resistance line 1 and the second resistance line 2 are connected in series and connected to a display panel driving chip 3, and a connection point between the first resistance line 1 and the second resistance line 2 is a crack detection point 5.
The first resistance line and the second resistance line that will be used for detecting in this application all set up on display panel, and first resistance line and second resistance line all adopt the same technology to prepare, if the technology influences the resistance of resistance line, the resistance difference of two resistance lines is the same or close in this embodiment, fine having avoided because the difference of production technology leads to the resistance difference different, the phenomenon of the crack detection function misjudgement that further leads to, the improvement crack detection's that can be very big rate of accuracy.
Further, the display panel 4 includes a display area and a non-display area, and the first resistance line 1, the second resistance line 2 and the driving chip 3 are disposed in the non-display area of the display panel.
As shown in fig. 1, the display panel includes a display area and a non-display area, the non-display area is generally disposed around the display area, wherein an area within an imaginary line in fig. 1 is the display area, an area outside the imaginary line is the non-display area, the first resistance line and the second resistance line are disposed in the non-display area, the display of the display panel is not affected, the second resistance line is disposed along a circumferential direction of the display panel and is disposed around the display area, and if a crack occurs in the display substrate during the panel manufacturing process, the second resistance line may also be broken due to the generation of the crack, so that an electrical parameter of the second resistance line changes.
Furthermore, the display panel driving chip is arranged at one end of the display panel, one port of the driving chip is connected to the first resistance line, and the other port of the driving chip is connected to the second resistance line.
In this embodiment, the first resistance line and the second resistance line are connected to the driving chip, and the driving chip supplies a voltage to the first resistance line and the second resistance line.
Further, the first resistance line is arranged on one side of the display panel close to the driving chip. In this embodiment, the second resistance line needs to be arranged around the display area of the display panel, and therefore, the first resistance line arranged on the display panel cannot affect the routing of the second resistance line, and the first resistance line is arranged on the side close to the driving chip, so that the routing of the first resistance line is completed in a small range as much as possible.
Furthermore, the second resistance lines are at least arranged on three sides of the display panel where the driving chip is not arranged.
In this embodiment, the first resistance lines are arranged on the periphery of the display panel, and arranged around the display area as much as possible, and arranged on at least three sides, as shown in fig. 1, since one side of the display panel close to the driving chip is not easily damaged during the preparation process, the second resistance lines are arranged on the left and right sides and the lower side of the display panel shown in fig. 1, and the second resistance lines are not arranged on one side close to the driving chip, so that the detection of whether the display panel has cracks or not can be realized; furthermore, the second resistance lines can be arranged around the whole display area, so that the crack detection of the display panel is more accurate.
Further, the crack detection point is connected to the display panel driving chip.
In the present embodiment, the crack detection of the display panel is performed by detecting the voltage at the point V1 between the first resistance line and the second resistance line, and the crack detection point is connected to the driving circuit to perform the voltage value detection.
The embodiment also provides a display panel comprising the crack detection circuit.
The embodiment also provides a display panel crack detection method, which adopts the crack detection circuit to detect.
The detection method in this embodiment adopts the detection circuit, wherein the first resistance line and the second resistance line are both disposed on the display panel, specifically disposed in the non-display area of the display panel, and both the first resistance line and the second resistance line are disposed on the same panel while the display effect of the display panel is not affected, so that the first resistance line and the second resistance line are prepared in the panel preparation process.
Further, the detection method comprises the following steps: and detecting the voltage value of a crack detection point between the first resistance wire and the second resistance wire, and judging whether the voltage value of the crack detection point is a set range value.
The voltage value of the crack detection point is detected to judge whether the display panel has cracks or not, the voltage detection method is simple, and the condition of the display panel can be accurately and effectively judged.
Go toThe detection method comprises the following specific steps: supplying a voltage V0 to the first resistance line R1 and the second resistance line R2, and detecting whether the voltage value V1 at the crack detection point satisfies the following condition:
as shown in fig. 2, it is a PCD detection circuit diagram in this embodiment, wherein the first resistor and the second resistor are both disposed on the display panel, and their resistance values are different, wherein a voltage at a point V1 between the first resistor and the second resistor is monitored by way of resistor voltage division, and the voltage at the point V1 is the voltage at the point V1
In order to make the determination simpler, the resistance values of the first resistor and the second resistor are set to be the same, and detection is required
Judging whether the V1 value meets the above condition, the V1 value may be changed due to the limitation of other conditions such as the prior art, but still remains
Since the voltage V1 varies left and right, it can be determined that the display panel is not broken if V1 satisfies the set range.
The method eliminates the condition that the resistance value deviation of the first resistor and the second resistor is different due to different production processes, well avoids the phenomenon of PCD misjudgment, and greatly improves the production yield of a production line.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A crack detection circuit includes a first resistance line and a second resistance line provided on a display panel, the second resistance line being provided along a circumferential direction of the display panel,
the first resistance line and the second resistance line are connected in series and connected to a display panel driving chip, and a connection point between the first resistance line and the second resistance line is a crack detection point.
2. The crack detection circuit of claim 1, wherein the display panel comprises a display area and a non-display area, and the first resistance line, the second resistance line and the driving chip are disposed in the non-display area of the display panel.
3. The crack detection circuit of claim 2, wherein the driving chip is disposed at one end of the display panel, and one port of the driving chip is connected to the first resistance line and the other port is connected to the second resistance line.
4. The crack detection circuit of claim 2, wherein the first resistance line is disposed on a side of the display panel near the driver chip.
5. The crack detection circuit of claim 4, wherein the second resistance line is disposed at least on three sides of the display panel on which the driving chip is not disposed.
6. The crack detection circuit of claim 2, wherein the crack detection point is connected to the display panel driver chip.
7. A display panel comprising the crack detection circuit of any one of claims 1 to 6.
8. A method for detecting cracks in a display panel, characterized in that the crack detection circuit according to any one of claims 1-6 is used for detection.
9. The display panel crack detection method of claim 8, wherein a voltage value at a crack detection point between the first resistance line and the second resistance line is detected, and it is determined whether the voltage value at the crack detection point is a set range value.
10. The display panel crack detection method according to claim 8, characterized in that: supplying a voltage V0 to the first resistance line R1 and the second resistance line R2, and detecting whether a voltage value V1 of the crack detection point satisfies the following condition:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010536325.7A CN111508401A (en) | 2020-06-12 | 2020-06-12 | Crack detection circuit, display panel and crack detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010536325.7A CN111508401A (en) | 2020-06-12 | 2020-06-12 | Crack detection circuit, display panel and crack detection method |
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| CN111508401A true CN111508401A (en) | 2020-08-07 |
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