CN114035355B - Detection method and detection system for display panel - Google Patents
Detection method and detection system for display panel Download PDFInfo
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- CN114035355B CN114035355B CN202111385814.8A CN202111385814A CN114035355B CN 114035355 B CN114035355 B CN 114035355B CN 202111385814 A CN202111385814 A CN 202111385814A CN 114035355 B CN114035355 B CN 114035355B
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- 238000001514 detection method Methods 0.000 title claims abstract description 58
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 107
- 239000000758 substrate Substances 0.000 claims description 57
- 238000000034 method Methods 0.000 claims description 27
- 238000007689 inspection Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 description 23
- 239000000178 monomer Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 8
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- 230000003068 static effect Effects 0.000 description 8
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- 229910052737 gold Inorganic materials 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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Abstract
The embodiment of the application discloses a detection method and a detection system of a display panel, wherein the detection method of the display panel comprises the following steps: applying a first voltage to a display panel to be detected, wherein the first voltage is a direct current signal; and applying a second voltage to the display panel, wherein the second voltage is an alternating current signal. According to the detection method of the display panel, the AOI power-on mode is designed into two sections, and the direct-current voltage is applied to the first section so as to conveniently detect the display of the pixel unit; the alternating current deflection voltage different from that of the first section is applied to the second section so that the pretilt angle of the liquid crystal molecules is restored to a state to be detected, stability of the pretilt angle of the liquid crystal molecules is guaranteed, and the problem that the pretilt angle of the liquid crystal molecules changes through AOI, and display quality of a display panel is reduced is solved.
Description
Technical Field
The application relates to the technical field of display, in particular to a detection method and a detection system for a display panel.
Background
TFT-LCD display panels currently on the mainstream market are classified into three types, namely a Twisted Nematic (TN) type or a super Twisted Nematic (Super Twisted Nematic, STN) type, an in-plane switching (InPlane Switching, IPS) type, and a vertical alignment (Vertical Alignment, VA) type. Among them, VA-type liquid crystal displays have extremely high contrast ratio compared with other types of liquid crystal displays, and have extremely wide application in large-sized displays such as televisions.
The high vertical alignment (High Vertical Alignment, HVA) mode is an important branch in VA mode. The HVA photoalignment technology is to apply voltage to a box-formed liquid crystal panel filled with liquid crystal and irradiate ultraviolet light to make photosensitive Monomer (Monomer) doped in the liquid crystal molecule and PI alignment base material undergo polymerization reaction to form Polymer, and the liquid crystal molecule is uniformly arranged along the direction of the Polymer molecule due to the interaction between the Polymer and the liquid crystal molecule so as to form pretilt angle (Pre-tilt) required by display.
The HVA process is mainly divided into two alignment processes: the first UV (ultraviolet-Violet Ray) alignment and the second UV alignment, wherein, automatic optical detection (Automated Optical Inspection, AOI) is performed after the first UV alignment, and the AOI is mainly to check whether the display of the pixel unit is defective by lighting the pixel unit, and the pre-tilt angle of the liquid crystal molecule is changed to a certain extent by the existing AOI power-up mode, which results in a difference between the pre-tilt angles of the liquid crystal molecules passing through the AOI and the liquid crystal molecules not passing through the AOI, and affects the display quality of the display panel.
Disclosure of Invention
The embodiment of the application provides a detection method and a detection system for a display panel, which can solve the problem that the display quality of the display panel is reduced due to the fact that the pretilt angle of liquid crystal molecules is changed through AOI.
In one aspect, the present application provides a method for detecting a display panel, including the following steps: applying a first voltage to a display panel to be detected, wherein the first voltage is a direct current signal; and applying a second voltage to the display panel, wherein the second voltage is an alternating current signal.
Optionally, in some embodiments of the present application, before the step of applying a first voltage to the display panel to be detected, the first voltage is a dc signal, the method further includes: and applying a third voltage to the display panel, wherein the third voltage is an alternating current signal.
Optionally, in some embodiments of the present application, before the step of applying a third voltage to the display panel, the third voltage is an ac signal, the method further includes: and performing first ultraviolet irradiation on the display panel.
Optionally, in some embodiments of the present application, after the step of applying a second voltage to the display panel, the second voltage is an ac signal, the method further includes: and performing secondary ultraviolet irradiation on the display panel.
Optionally, in some embodiments of the present application, the second voltage and the third voltage are each 10 hertz in frequency and each 1 second in duration.
On the other hand, the application also provides a detection system and a display panel, wherein the display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate, and a common electrode is arranged on the color film substrate; the color film substrate comprises a color film substrate, a detection module and a display module, wherein the detection module sequentially applies a first voltage and a second voltage to a common electrode of the color film substrate, the first voltage is a direct current signal, and the second voltage is an alternating current signal.
Optionally, in some embodiments of the present application, the detection module further applies a third voltage to the common electrode of the color film substrate before applying the first voltage to the common electrode of the color film substrate, where the third voltage is an ac signal.
Optionally, in some embodiments of the present application, the first ultraviolet irradiation is performed on the display panel before the detection module applies the third voltage to the common electrode of the color film substrate.
Optionally, in some embodiments of the present application, the second ultraviolet irradiation is performed on the display panel after the detection module applies a second voltage to the common electrode of the color film substrate.
Optionally, in some embodiments of the present application, the second voltage and the third voltage are each 10 hertz in frequency and each 1 second in duration.
Compared with the existing AOI detection, the method can enable the pretilt angle of the liquid crystal molecules to change to a certain extent, so that the pretilt angle of the liquid crystal molecules passing through the AOI is different from that of the liquid crystal molecules not passing through the AOI. Applying a first voltage to a display panel to be detected, wherein the first voltage is a direct current signal; and applying a second voltage to the display panel, wherein the second voltage is an alternating current signal. According to the detection method of the display panel, the AOI power-on mode is designed into two sections, and the direct-current voltage is applied to the first section so as to conveniently detect the display of the pixel unit; the alternating current deflection voltage different from that of the first section is applied to the second section so that the pretilt angle of the liquid crystal molecules is restored to a state to be detected, stability of the pretilt angle of the liquid crystal molecules is guaranteed, and the problem that the pretilt angle of the liquid crystal molecules changes through AOI, and display quality of a display panel is reduced is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a detection method of a first display panel according to an embodiment of the present application;
fig. 2 is a schematic signal timing diagram of a first display panel according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a second method for detecting a display panel according to an embodiment of the present application;
fig. 4 is a schematic signal timing diagram of a second display panel according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a power-up mode of a display panel according to an embodiment of the present application.
Wherein,,
100. the display panel comprises a display panel body 10, a color film substrate 11, a common electrode 12, a first polymer alignment film 20, an array substrate 21, a transparent electrode 22, a second polymer alignment film 30, a liquid crystal layer/liquid crystal molecule 40 and a conductive object.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The embodiment of the application provides a detection method and a detection system for a display panel, which can solve the problem that the display quality of the display panel is reduced due to the fact that the pretilt angle of liquid crystal molecules is changed through AOI. The following description of the embodiments is not intended to limit the preferred embodiments. In addition, in the description of the present application, the term "comprising" means "including but not limited to". The terms "first," "second," "third," and the like are used merely as labels, and are used for distinguishing between different objects and not for describing a particular sequential order.
The liquid crystal display uses the liquid crystal molecules 30 to have refractive index anisotropy, and controls brightness of light transmitted by the liquid crystal molecules 30 by applying a voltage to the liquid crystal molecules 30 and thereby redirecting an axis of the refractive index anisotropy. The liquid crystal layer 30 is the main body of the liquid crystal display, and the liquid crystal layer 30 used for different devices is mostly formed by mixing several or more than ten kinds of monomer liquid crystal layers 30. The liquid crystal layer 30 generally includes: liquid crystal molecules 30 and photo-or thermally polymerizable polymer monomers.
In the VA mode liquid crystal display, the liquid crystal molecules 30 are almost completely vertically aligned in the absence of an applied voltage, but the liquid crystal molecules 30 are caused to tilt in a pretilt direction set by a plurality of protrusions and slits on the vertically aligned alignment film when the voltage is applied. In the case of a liquid crystal display having a polarizing plate, the tilt directions of the liquid crystal molecules 30 are controlled to be at an angle of 45 ° to the absorption axis of the polarizing plate. However, the liquid crystal molecules 30 as a continuous medium may be tilted in their intermediate directions, and a liquid crystal region having a different tilt angle from the set pretilt angle is inevitably present. The presence of such a region causes the liquid crystal display to have a case where display luminance is not uniform in the vicinity of the region. In the case of such non-uniformity of liquid crystal alignment, a component having light or heat polymerizable property may be added to the liquid crystal layer 30, and the polymerizable component may be polymerized when voltage or light is applied, thereby defining the tilt direction of the liquid crystal molecules 30 when voltage is applied.
The HVA process is mainly divided into two alignment processes, wherein the first ultraviolet alignment is to apply voltage to the liquid crystal panel and irradiate the liquid crystal panel with ultraviolet rays at a certain temperature to make the photosensitive monomer mixed with the liquid crystal chemically react so as to make the liquid crystal arranged in a certain angle orientation; the second ultraviolet alignment is to perform the second UV irradiation to the photosensitive monomer which is not completely reacted in the liquid crystal, so as to promote the complete reaction of the photosensitive monomer in the liquid crystal. The AOI is performed after the first UV alignment, a voltage is mainly applied to the substrate through a voltage source, so that the pixel units are lightened, a high-power camera is used for photographing, the displayed pixel unit pattern is compared with a standard pattern, and the display difference of the pixel units is checked to confirm whether the display is abnormal or not. The existing AOI power-up mode can cause a certain change of the pretilt angle of the liquid crystal molecules 30, so that the pretilt angle of the liquid crystal molecules 30 passing through the AOI is different from that of the liquid crystal molecules 30 not passing through the AOI, and the display quality of the display panel is affected.
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a first method for detecting a display panel according to an embodiment of the present application; fig. 2 is a schematic signal timing diagram of a first display panel according to an embodiment of the present disclosure; as shown in fig. 1 and 2, an embodiment of the present application provides a method for detecting a display panel, including the following steps:
s10, applying a first voltage D1 to a display panel to be detected, wherein the first voltage D1 is a direct current signal and is used for detecting the display condition of a pixel unit in the display panel.
In this embodiment of the present application, the first voltage D1 is applied to the common electrode 11 of the color film substrate 10, preferably, the first voltage D1 is a dc voltage, so that display detection of the pixel unit is conveniently performed at this stage, and the use of the dc voltage can avoid the flicker phenomenon that the pixel unit displays bright and dark images and alternates due to the ac voltage signal from affecting execution of AOI detection, and ensure accuracy of AOI detection.
In the embodiment of the present application, the duration of the first voltage D1 may be adjusted according to the detection time, which is not limited herein.
S20, applying a second voltage D2 to the display panel, wherein the second voltage D2 is an alternating current signal, so that the pretilt angle of the liquid crystal molecules 30 in the display panel is restored to a state to be detected.
In this embodiment of the present application, the second voltage D2 is applied to the common electrode 11 of the color film substrate 10, where the second voltage D2 is an ac deflection voltage, and the frequency of the second voltage D2 is 10 hz, and the duration time is 1 second, so that the deflection angle of the liquid crystal molecules 30 is restored to a state before the first voltage D1 is applied to the display panel to be detected, and the pretilt angle of the liquid crystal molecules 30 is not changed after the second voltage D2 is applied to the display panel, so as to ensure the stability of the pretilt angle of the liquid crystal molecules 30.
In this embodiment, before the step of applying the first voltage D1 to the display panel 100, the first voltage D1 is a dc signal, the method further includes: the display panel 100 is subjected to the first ultraviolet irradiation so that the polymer monomers in the liquid crystal molecules 30 synthesize polymers to form the first and second polymer alignment films 12 and 22 on the inner surfaces of the color film substrate 10 and the array substrate 20.
In the embodiment of the present application, after the step of applying the second voltage D2 to the display panel 100, the second voltage D2 is an ac signal, the method further includes: the second ultraviolet irradiation is performed to the display panel 100, and the second ultraviolet irradiation is performed to the polymer monomer which is not completely reacted in the liquid crystal molecules 30, so that the polymer monomer in the liquid crystal molecules 30 is completely reacted, and the deflection angles of the liquid crystal molecules 30 of the display panel 100 are consistent.
Compared with the existing AOI detection, the method can enable the pretilt angle of the liquid crystal molecules to change to a certain extent, so that the pretilt angle of the liquid crystal molecules passing through the AOI is different from that of the liquid crystal molecules not passing through the AOI. Applying a first voltage to a display panel to be detected, wherein the first voltage is a direct current signal; and applying a second voltage to the display panel, wherein the second voltage is an alternating current signal. According to the detection method of the display panel, the AOI power-on mode is designed into two sections, and the direct-current voltage is applied to the first section so as to conveniently detect the display of the pixel unit; the alternating current deflection voltage different from that of the first section is applied to the second section so that the pretilt angle of the liquid crystal molecules is restored to a state to be detected, stability of the pretilt angle of the liquid crystal molecules is guaranteed, and the problem that the pretilt angle of the liquid crystal molecules changes through AOI, and display quality of a display panel is reduced is solved.
As a specific embodiment of the present application, referring to fig. 3 and fig. 4, fig. 3 is a flowchart of a detection method of a second display panel provided in an embodiment of the present application; fig. 4 is a schematic signal timing diagram of a second display panel according to an embodiment of the present disclosure; as shown in fig. 3 and 4, an embodiment of the present application provides a method for detecting a display panel, including the following steps:
s101, applying a third voltage D3 to the display panel to be detected, wherein the third voltage D3 is an alternating current signal, so that static electricity in the display panel is reduced.
In this embodiment, the third voltage D3 is applied to the common electrode 11 of the color film substrate 10, preferably, the third voltage D3 is an ac deflection voltage, and an ac signal on the common electrode 11 of the color film substrate 10 is transferred to the transparent electrode 21 of the array substrate 20 through a gold ball, so as to reduce static electricity on the color film substrate 10 and the array substrate 20, avoid abnormal alignment of the liquid crystal molecules 30, and ensure accuracy of AOI detection.
In the embodiment of the present application, the frequency of the third voltage D3 is 10 hz, and the duration is 1 second.
S201, a first voltage D1 is applied to a display panel to be detected, wherein the first voltage D1 is a direct current signal and is used for detecting the display condition of a pixel unit in the display panel.
In this embodiment of the present application, the first voltage D1 is applied to the common electrode 11 of the color film substrate 10, preferably, the first voltage D1 is a dc voltage, so that display detection of the pixel unit is conveniently performed at this stage, and the use of the dc voltage can avoid the flicker phenomenon that the pixel unit displays bright and dark images and alternates due to the ac voltage signal from affecting execution of AOI detection, and ensure accuracy of AOI detection.
In the embodiment of the present application, the duration of the first voltage D1 may be adjusted according to the detection time, which is not limited herein.
S301, applying a second voltage D2 to the display panel, where the second voltage D2 is an ac signal, so as to restore the pretilt angle of the liquid crystal molecules 30 in the display panel to the state to be detected.
In this embodiment of the present application, the second voltage D2 is applied to the common electrode 11 of the color film substrate 10, where the second voltage D2 is an ac deflection voltage, and the frequency of the second voltage D2 is 10 hz, and the duration time is 1 second, so that the deflection angle of the liquid crystal molecules 30 is restored to a state before the first voltage D1 is applied to the display panel to be detected, and the pretilt angle of the liquid crystal molecules 30 is not changed after the second voltage D2 is applied to the display panel, so as to ensure the stability of the pretilt angle of the liquid crystal molecules 30.
In the embodiment of the present application, before the step of applying the third voltage D3 to the display panel 100, the third voltage D3 is an ac signal, the method further includes: the display panel 100 is subjected to the first ultraviolet irradiation so that the polymer monomers in the liquid crystal molecules 30 synthesize polymers to form the first and second polymer alignment films 12 and 22 on the inner surfaces of the color film substrate 10 and the array substrate 20.
In the embodiment of the present application, after the step of applying the second voltage D2 to the display panel 100, the second voltage D2 is an ac signal, the method further includes: the second ultraviolet irradiation is performed to the display panel 100, and the second ultraviolet irradiation is performed to the polymer monomer which is not completely reacted in the liquid crystal molecules 30, so that the polymer monomer in the liquid crystal molecules 30 is completely reacted, and the deflection angles of the liquid crystal molecules 30 of the display panel 100 are consistent.
Compared with the existing AOI detection, the method can enable the pretilt angle of the liquid crystal molecules to change to a certain extent, so that the pretilt angle of the liquid crystal molecules passing through the AOI is different from that of the liquid crystal molecules not passing through the AOI. Applying a first voltage to a display panel to be detected, so that static electricity in the display panel is reduced; applying a second voltage to the display panel for detecting a display condition of a pixel unit in the display panel; and applying a third voltage to the display panel to restore the pretilt angle of the liquid crystal molecules in the display panel to a state to be detected. According to the detection method of the display panel, the AOI power-on mode is designed into three sections, and the alternating current deflection voltage is added to the first section, so that the accuracy of AOI detection is ensured by less static electricity; applying a DC voltage to the second segment to facilitate detection of the display of the pixel unit; and applying the same alternating current deflection voltage as that of the first section to the third section so as to enable the pretilt angle of the liquid crystal molecules to be restored to a state to be detected, thereby ensuring the stability of the pretilt angle of the liquid crystal molecules, and further solving the problem that the pretilt angle of the liquid crystal molecules is changed through AOI, so that the display quality of the display panel is reduced.
On the other hand, referring to fig. 5 and 6, fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present application; fig. 6 is a schematic diagram of a power-up mode of a display panel according to an embodiment of the present application; as shown in fig. 5 and 6, the present application further provides a display system, including: the display panel 100 and the detection module (not shown in the figure), the display panel 100 comprises a color film substrate 10, an array substrate 20, a liquid crystal layer 30 and the detection module, wherein the color film substrate 10 is provided with a common electrode 11; the array substrate 20 is provided with a plurality of pixel units (not shown) and transparent electrodes 21; the liquid crystal layer 30 is arranged between the array substrate 20 and the color film substrate 10; preferably, the detection module sequentially applies a third voltage D3, a first voltage D1, and a second voltage D2 to the common electrode 11 of the color film substrate 10, for detecting the display condition of the pixel unit and making the pretilt angle of the liquid crystal molecules 30 in the liquid crystal layer 30 be the same as that in the state to be detected. The first voltage D1 and the third voltage D3 are the same, and the first voltage D1 and the second voltage D2 are different. Preferably, the first voltage D1 and the third voltage D3 are both ac deflection voltages; the second voltage D2 is a dc voltage.
In this embodiment, the detection module includes a voltage power supply, a metal connection wire, a high-definition camera, etc., and fig. 5 only shows a manner in which a voltage signal is transmitted between the common electrode 11 of the color film substrate 10 and the transparent electrode 21 of the array substrate 20.
In the embodiment of the present application, as shown in fig. 6, the display panel further includes a conductive material 40, such as gold balls, for electrically connecting the array substrate 20 and the color film substrate 10; wherein the inner surface of the array substrate 20 and the inner surface of the color film substrate 10 are respectively provided with a first polymer alignment film 12 and a second polymer alignment film 22 for maintaining a pretilt angle of the liquid crystal molecules 30 in the liquid crystal layer 30.
In the embodiment of the application, the third voltage D3 is applied to the display panel to be detected, and the third voltage D3 is an ac signal, so that static electricity in the display panel is reduced.
In this embodiment, the third voltage D3 is applied to the common electrode 11 of the color film substrate 10, preferably, the third voltage D3 is an ac deflection voltage, and an ac signal on the common electrode 11 of the color film substrate 10 is transferred to the transparent electrode 21 of the array substrate 20 through a gold ball, so as to reduce static electricity on the color film substrate 10 and the array substrate 20, avoid abnormal alignment of the liquid crystal molecules 30, and ensure accuracy of AOI detection.
In the embodiment of the present application, the frequency of the third voltage D3 is 10 hz, and the duration is 1 second.
Further, a first voltage D1 is applied to the display panel to be detected, where the first voltage D1 is a dc signal for detecting a display condition of the pixel unit in the display panel.
In this embodiment of the present application, the first voltage D1 is applied to the common electrode 11 of the color film substrate 10, preferably, the first voltage D1 is a dc voltage, so that display detection of the pixel unit is conveniently performed at this stage, and the use of the dc voltage can avoid the flicker phenomenon that the pixel unit displays bright and dark images and alternates due to the ac voltage signal from affecting execution of AOI detection, and ensure accuracy of AOI detection.
In the embodiment of the present application, the duration of the first voltage D1 may be adjusted according to the detection time, which is not limited herein.
Further, a second voltage D2 is applied to the display panel, and the second voltage D2 is an ac signal, so that the pretilt angle of the liquid crystal molecules 30 in the display panel is restored to the state to be detected.
In this embodiment of the present application, the second voltage D2 is applied to the common electrode 11 of the color film substrate 10, where the second voltage D2 is an ac deflection voltage, and the frequency of the second voltage D2 is 10 hz, and the duration time is 1 second, so that the deflection angle of the liquid crystal molecules 30 is restored to a state before the first voltage D1 is applied to the display panel to be detected, and the pretilt angle of the liquid crystal molecules 30 is not changed after the second voltage D2 is applied to the display panel, so as to ensure the stability of the pretilt angle of the liquid crystal molecules 30.
In the embodiment of the present application, before the step of applying the third voltage D3 to the display panel 100, the third voltage D3 is an ac signal, the method further includes: the display panel 100 is subjected to the first ultraviolet irradiation so that the polymer monomers in the liquid crystal molecules 30 synthesize polymers to form the first and second polymer alignment films 12 and 22 on the inner surfaces of the color film substrate 10 and the array substrate 20.
In the embodiment of the present application, after the step of applying the second voltage D2 to the display panel 100, the second voltage D2 is an ac signal, the method further includes: the second ultraviolet irradiation is performed to the display panel 100, and the second ultraviolet irradiation is performed to the polymer monomer which is not completely reacted in the liquid crystal molecules 30, so that the polymer monomer in the liquid crystal molecules 30 is completely reacted, and the deflection angles of the liquid crystal molecules 30 of the display panel 100 are consistent.
Compared with the existing AOI detection, the method can enable the pretilt angle of the liquid crystal molecules to change to a certain extent, so that the pretilt angle of the liquid crystal molecules passing through the AOI is different from that of the liquid crystal molecules not passing through the AOI. Applying a first voltage to a display panel to be detected, so that static electricity in the display panel is reduced; applying a second voltage to the display panel for detecting a display condition of a pixel unit in the display panel; and applying a third voltage to the display panel to restore the pretilt angle of the liquid crystal molecules in the display panel to a state to be detected. The detection method of the display panel is characterized in that an AOI power-on mode is designed into two to three sections, and is preferably divided into three sections, wherein alternating current deflection voltage is added to the first section, so that accuracy of AOI detection is ensured by less static electricity; applying a DC voltage to the second segment to facilitate detection of the display of the pixel unit; and applying the same alternating current deflection voltage as that of the first section to the third section so as to enable the pretilt angle of the liquid crystal molecules to be restored to a state to be detected, thereby ensuring the stability of the pretilt angle of the liquid crystal molecules, and further solving the problem that the pretilt angle of the liquid crystal molecules is changed through AOI, so that the display quality of the display panel is reduced.
The foregoing has described in detail the detection method and detection system for a display panel provided in the embodiments of the present application, and specific examples have been applied to illustrate the principles and embodiments of the present application, where the foregoing examples are only for aiding in understanding the method and core ideas of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the contents of the present specification should not be construed as limiting the present application in summary.
Claims (6)
1. A method for detecting a display panel, wherein the display panel is an HVA type display panel, the method comprising the steps of:
performing first ultraviolet irradiation on the display panel;
applying a third voltage to the display panel, wherein the third voltage is an alternating current signal;
applying a first voltage to a display panel to be detected, wherein the first voltage is a direct current signal;
and applying a second voltage to the display panel, wherein the second voltage is an alternating current signal.
2. The method of claim 1, further comprising, after the step of applying a second voltage to the display panel, the second voltage being an ac signal:
and performing secondary ultraviolet irradiation on the display panel.
3. The method according to claim 1, wherein the second voltage and the third voltage are each 10 hz in frequency and each 1 second in duration.
4. A detection system, comprising:
the display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate, wherein a common electrode is arranged on the color film substrate;
the detection module is used for sequentially applying a third voltage, a first voltage and a second voltage to the common electrode of the color film substrate after the display panel is irradiated by ultraviolet rays for the first time, wherein the third voltage is an alternating current signal, the first voltage is a direct current signal, and the second voltage is an alternating current signal.
5. The inspection system of claim 4, wherein the second ultraviolet irradiation is performed on the display panel after the inspection module applies a second voltage to the common electrode of the color film substrate.
6. The detection system of claim 4, wherein the second voltage and the third voltage are each 10 hertz in frequency and each 1 second in duration.
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