CN108053785B - Detection module and detection device of OLED display panel - Google Patents
Detection module and detection device of OLED display panel Download PDFInfo
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- CN108053785B CN108053785B CN201711487449.5A CN201711487449A CN108053785B CN 108053785 B CN108053785 B CN 108053785B CN 201711487449 A CN201711487449 A CN 201711487449A CN 108053785 B CN108053785 B CN 108053785B
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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
Abstract
The embodiment of the invention discloses a detection module of an OLED display panel, which comprises: a power supply unit for outputting a power supply voltage; a digital potentiometer electrically connected to an output terminal of the power supply unit and receiving the power supply voltage; the central processing unit is electrically connected with the digital potentiometer and is used for controlling the resistance value change of the digital potentiometer so as to adjust the output voltage of the digital potentiometer; the DC output unit is electrically connected with the digital potentiometer, the power supply voltage is output to the DC output unit after being regulated by the digital potentiometer, and the DC output unit is used for outputting voltage to the OLED display panel so as to test the poor display of the OLED display panel. The embodiment of the invention also discloses a detection device of the OLED display panel. The invention has the advantage of conveniently detecting the defects of the OLED display panel.
Description
Technical Field
The invention relates to the technical field of OLED display panel detection, in particular to a detection module and a detection device of an OLED display panel.
Background
Organic Light-Emitting Diode (OLED) display panels are popular because they are Light, thin, energy-saving, wide in viewing angle, wide in color gamut, high in contrast, and the like. However, in the process of manufacturing the OLED display panel, due to the manufacturing process, there may occur defects such as dark lines, bright dark frames, mura in low gray levels, etc., and the defects are found by detecting the OLED display panel after the Cell stage in the prior art.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a detection module and a detection device for an OLED display panel. The method can be used for conveniently detecting the defects of the OLED display panel.
In order to solve the above technical problem, an embodiment of a first aspect of the present invention provides a detection module for an OLED display panel, including:
a power supply unit for outputting a power supply voltage;
a digital potentiometer electrically connected to an output terminal of the power supply unit and receiving the power supply voltage;
the central processing unit is electrically connected with the digital potentiometer and is used for controlling the resistance value change of the digital potentiometer so as to adjust the output voltage of the digital potentiometer;
the DC output unit is electrically connected with the digital potentiometer, the power supply voltage is output to the DC output unit after being regulated by the digital potentiometer, and the DC output unit is used for outputting voltage to the OLED display panel so as to test the poor display of the OLED display panel.
In an embodiment of the first aspect of the present invention, the detection module further includes a voltage detection unit and an analog-to-digital conversion unit, the voltage detection unit is electrically connected to the digital potentiometer, the analog-to-digital conversion unit is electrically connected to the voltage detection unit, and the analog-to-digital conversion unit is further electrically connected to the central processing unit.
In an embodiment of the first aspect of the present invention, the detection module further includes a current detection unit, the current detection unit is electrically connected to the DC output unit, and the current detection unit is further electrically connected to the central processing unit.
In an embodiment of the first aspect of the present invention, the output voltage of the DC output unit is used for a high-level power source terminal, a low-level power source terminal, or a data voltage terminal provided to the OLED display panel.
In an embodiment of the first aspect of the present invention, the detection module further includes a display unit, the display unit is electrically connected to the central processing unit, and the display unit displays the output voltage of the digital potentiometer and the output current of the DC output unit.
The embodiment of the second aspect of the invention provides a detection device for an OLED display panel, which includes a plurality of detection modules.
In one embodiment of the second aspect of the present invention, the central processors of the plurality of detection modules are integrated together.
In an embodiment of the second aspect of the present invention, the number of the detection modules is at least 3.
In an embodiment of the second aspect of the present invention, the DC output unit of one of the at least 3 detection modules is configured to output a voltage to the high-level power end of the OLED display panel, the DC output unit of another one of the at least 3 detection modules is configured to output a voltage to the low-level power end of the OLED display panel, and the DC output unit of another one of the at least 3 detection modules is configured to output a voltage to the data voltage end of the OLED display panel.
In an embodiment of the second aspect of the present invention, the DC output unit of each of the detection modules is integrated on a circuit board.
The embodiment of the invention has the following beneficial effects:
the detection module of the OLED display panel comprises: a power supply unit for outputting a power supply voltage; a digital potentiometer electrically connected to an output terminal of the power supply unit and receiving the power supply voltage; the central processing unit is electrically connected with the digital potentiometer and is used for controlling the resistance value change of the digital potentiometer so as to adjust the output voltage of the digital potentiometer; the DC output unit is electrically connected with the digital potentiometer, the power supply voltage is output to the DC output unit after being regulated by the digital potentiometer, and the DC output unit is used for outputting voltage to the OLED display panel so as to test the poor display of the OLED display panel. Therefore, the output voltage of the detection module can be conveniently adjusted through the digital potentiometer, the detection module outputs different output voltages, the OLED display panel can display different brightness, and then whether dark lines, bright lines, slightly bright dark pictures, mura and the like exist in the OLED display panel under different voltage conditions can be conveniently detected, so that whether the OLED display panel is poor or not is easily judged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a detection module of an OLED display panel according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of driving an OLED in an OLED display panel according to an embodiment of the present invention;
FIG. 3 is a block diagram of an apparatus for inspecting an OLED display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of this application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
Referring to fig. 1, the detection module 100 includes a power supply unit 110, a digital potentiometer 120, a central processing unit 130, and a DC output unit 140.
In the present embodiment, the power supply unit 110 is used for outputting a dc power voltage, and the power supply unit 110 includes, for example, a dry battery, a storage battery, or other dc power supply to provide a circuit.
In the present embodiment, the digital potentiometer 120 is electrically connected to the output terminal of the power supply unit 110, so that the power supply voltage is received by the digital potentiometer 120. In this embodiment, the digital potentiometer 120 may adjust an internal resistance value thereof, and by receiving different control signals, the digital potentiometer 120 may obtain different resistance values, and each digital potentiometer 120 may obtain a plurality of different resistance values through adjustment and control. In this embodiment, the input terminal of the digital potentiometer 120 receives the dc power voltage output by the power supply unit 110, and adjusts the dc power voltage to different resistance values, so as to output different dc voltages.
In this embodiment, the central processing unit 130 is electrically connected to the digital potentiometer 120, specifically, electrically connected to the control terminal of the digital potentiometer 120, where the central processing unit 130 is electrically connected to the digital potentiometer 120 through an I2C bus. In this embodiment, the central processing unit 130 outputs different control signals, and the digital potentiometer 120 sets different resistance values according to the different control signals of the central processing unit 130, so as to adjust the magnitude of the output voltage of the digital potentiometer 120, for example, when a higher output voltage is required, the digital potentiometer 120 can be controlled to have a smaller resistance value, and when a lower output voltage is required, the digital potentiometer 120 can be controlled to have a higher resistance value.
In the present embodiment, the DC (direct current) output unit is electrically connected to the output terminal of the digital potentiometer 120, and is configured to receive the output voltage of the digital potentiometer 120. In this embodiment, the power voltage is adjusted by the digital potentiometer 120 and then output to the DC output unit 140, and the DC output unit 140 is configured to be electrically connected to the OLED display panel, so that the DC output unit 140 is configured to output a voltage to the OLED display panel. Therefore, when the central processing unit 130 automatically outputs different control signals, the digital potentiometer 120 has different resistance values, so that the digital potentiometer 120 automatically outputs different voltages to the DC output unit 140, and then the DC output unit 140 outputs different voltages to the OLED display panel, so that a user can observe the display condition of the OLED display panel receiving different voltages, and further can detect whether the OLED display panel has dark lines, bright lines, a partially bright dark picture, mura under low gray scale and the like under different voltages, thereby easily judging whether the OLED display panel has defects.
Referring to fig. 1 and 2 in combination, in the present embodiment, the output voltage of the DC output unit 140 is used for a high-level power source terminal VDD, a low-level power source terminal VSS, or a data voltage terminal Vdata provided to the OLED display panel. For example, when the output voltage of the DC output unit 140 is used for providing the high-level power terminal VDD or the low-level power terminal VSS of the OLED display panel, when the resistance value of the digital potentiometer 120 is changed, the driving current flowing through the light emitting diode OLED at this time is changed, so that the light emitting brightness of the light emitting diode OLED can be changed, and thus, whether the OLED display panel with different brightness has the defects of dark lines, bright lines, and partially bright dark images can be detected by a human eye or by a camera, so that whether the OLED display panel has the defects can be conveniently detected; when the output voltage of the DC output unit 140 is used for providing the data voltage terminal Vdata of the OLED display panel, when the resistance value of the digital potentiometer 120 is changed, the driving current flowing through the light emitting diode OLED is changed, so that the light emitting brightness of the light emitting diode OLED can be changed, and thus, a detection person can see through naked eyes or shoot through a camera device whether the OLED display panel has mura and other defects at a low gray scale, and thus, whether the OLED display panel has defects can be conveniently detected. In fig. 2, T1 and T2 are thin film transistors, Cst is a capacitor, and scan (n) is an nth-order scan signal.
Referring to fig. 1, in this embodiment, the detection module 100 further includes a voltage detection unit 150 and an analog-to-digital conversion unit 160, the voltage detection unit 150 is electrically connected to the output end of the digital potentiometer 120, so as to detect an output voltage of the digital potentiometer 120, where the voltage is an analog voltage, the analog-to-digital conversion unit 160 is electrically connected to the voltage detection unit 150, so as to convert the analog voltage signal detected by the voltage detection unit 150 into a digital voltage signal, and the analog-to-digital conversion unit 160 is further electrically connected to the central processing unit 130, so as to output the converted digital voltage signal to the central processing unit 130. In this embodiment, the detection module 100 further includes a current detection unit 170, the current detection unit 170 is electrically connected to the output end of the DC output unit 140, the current detection unit 170 is further electrically connected to the central processing unit 130, and the current detection unit 170 is configured to detect the output current of the DC output unit. In this embodiment, the detection module 100 further includes a display unit 180, and the display unit 180 is electrically connected to the central processor 130, in this embodiment, the display unit 180 is, for example, an LCD display screen, an OLED display screen, or the like. The display unit 180 displays the output voltage of the digital potentiometer 120 and the output current of the DC output unit 140, and when the central processing unit 130 controls the resistance value of the digital potentiometer 120 to change, the display unit 180 can facilitate a tester to visually observe the current changes of the output voltage of the digital potentiometer 120 and the output current of the DC output unit 140. In addition, the voltage detection unit 150 and the current detection unit 170 according to the embodiment of the invention are circuit structures well known to those skilled in the art, and are not described herein again.
Referring to fig. 2 and 3, the detection apparatus of the OLED display panel 500 includes a plurality of detection modules, for example, 2 detection modules, 3 detection modules, 4 detection modules, 5 detection modules, 6 detection modules, and the like. In this embodiment, the detection apparatus includes 3 detection modules, which are referred to as a first detection module 200, a second detection module 300, and a third detection module 400 in fig. 3. In this embodiment, the DC output unit of the first detection module 200 is configured to output a voltage to the high-level power terminal VDD of the OLED display panel 500, the DC output unit of the second detection module 300 is configured to output a voltage to the low-level power terminal VSS of the OLED display panel 500, and the DC output unit of the third detection module 400 is configured to output a voltage to the data voltage terminal Vdata of the OLED display panel 500. Therefore, through the three detection modules, the high-level power supply voltage, the low-level power supply voltage and the data voltage of the OLED display panel 500 can be respectively changed, so that the detection of bad conditions of the OLED display panel 500 under various conditions is facilitated. In addition, in other embodiments of the present invention, when more input voltages of the OLED display panel 500 need to be changed, more detection modules may be further provided.
In an embodiment of the invention, the central processors of the plurality of detection modules are integrated together. In addition, in other embodiments of the present invention, the central processing units of the plurality of detection modules may also be respectively and independently arranged.
In the embodiment of the present invention, the DC output units of a plurality of the detection modules are integrated on a circuit board, and the other end of the circuit board is electrically connected to the OLED display panel 500.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (9)
1. A detection module of an OLED display panel, comprising:
a power supply unit for outputting a power supply voltage;
the digital potentiometer is electrically connected with the output end of the power supply unit and receives the power supply voltage, and the digital potentiometer receives different control signals and adjusts different resistance values so as to output different voltages;
the central processing unit is electrically connected with the digital potentiometer and is used for controlling the resistance value change of the digital potentiometer so as to adjust the output voltage of the digital potentiometer;
the DC output unit is electrically connected with the digital potentiometer, the power supply voltage is output to the DC output unit after being regulated by the digital potentiometer, and the DC output unit is used for outputting voltage to a high-level power supply end, a low-level power supply end or a data voltage end of the OLED display panel so as to test poor display of the OLED display panel.
2. The detection module of the OLED display panel of claim 1, further comprising a voltage detection unit electrically connected to the digital potentiometer and an analog-to-digital conversion unit electrically connected to the voltage detection unit and further electrically connected to the cpu.
3. The sensing module of the OLED display panel of claim 2, further comprising a current sensing unit electrically connected to the DC output unit, the current sensing unit further electrically connected to the central processor.
4. The detection module of the OLED display panel of claim 1, further comprising a display unit electrically connected to the central processing unit, the display unit displaying an output voltage of the digital potentiometer and an output current of the DC output unit.
5. An inspection apparatus for an OLED display panel, comprising a plurality of inspection modules according to any one of claims 1 to 4.
6. The inspection apparatus of an OLED display panel as claimed in claim 5, wherein the central processors of the plurality of inspection modules are integrated together.
7. The apparatus for inspecting an OLED display panel according to claim 5, wherein the number of the inspection modules is at least 3.
8. The inspecting apparatus of claim 7, wherein the DC output unit of one of the at least 3 inspecting modules is used for outputting a voltage to a high power terminal of the OLED display panel, the DC output unit of another one of the at least 3 inspecting modules is used for outputting a voltage to a low power terminal of the OLED display panel, and the DC output unit of another one of the at least 3 inspecting modules is used for outputting a voltage to a data voltage terminal of the OLED display panel.
9. The apparatus of claim 5, wherein the DC output units of the plurality of the inspection modules are integrated on a circuit board.
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| CN108877613A (en) * | 2018-07-24 | 2018-11-23 | 武汉华星光电技术有限公司 | The test device and test method of display panel |
| US10783815B2 (en) | 2018-07-24 | 2020-09-22 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Testing apparatus and testing method for display panel |
| CN111179793B (en) * | 2020-01-06 | 2022-03-25 | 京东方科技集团股份有限公司 | Detection method and device for display substrate |
| CN111579903A (en) * | 2020-05-18 | 2020-08-25 | 格力电器（合肥）有限公司 | Display module testing tool and testing method |
| CN111679460B (en) * | 2020-06-02 | 2022-02-01 | Tcl华星光电技术有限公司 | Method and device for analyzing defects of display panel |
| CN112576808B (en) * | 2020-11-30 | 2023-02-17 | 浙江中控技术股份有限公司 | Display screen system for intelligent electric valve positioner and application method thereof |
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| CN2837878Y (en) * | 2005-11-21 | 2006-11-15 | 比亚迪股份有限公司 | LCD panel detector |
| JP2008096660A (en) * | 2006-10-11 | 2008-04-24 | Toshiba Matsushita Display Technology Co Ltd | Display device |
| CN203397248U (en) * | 2013-08-01 | 2014-01-15 | 天津天地伟业数码科技有限公司 | Stabilized voltage supply based on digital potentiometer |
| CN106782244B (en) * | 2017-01-03 | 2020-11-13 | 京东方科技集团股份有限公司 | Test method and test device for touch display screen |
| CN107045080A (en) * | 2017-06-20 | 2017-08-15 | 上海闻泰电子科技有限公司 | Voltage check part, intelligent terminal and voltage detection method |
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