CN109597223B - Liquid crystal display module and display detection circuit thereof - Google Patents
Liquid crystal display module and display detection circuit thereof Download PDFInfo
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- CN109597223B CN109597223B CN201811385685.0A CN201811385685A CN109597223B CN 109597223 B CN109597223 B CN 109597223B CN 201811385685 A CN201811385685 A CN 201811385685A CN 109597223 B CN109597223 B CN 109597223B
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- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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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 invention relates to a liquid crystal display module and a display detection circuit thereof. The display detection circuit comprises a module grounding circuit, a circuit board grounding circuit, a grounding module, a circuit board test circuit, an auxiliary detection circuit and a resistor R2; the module grounding circuit is arranged on the module body; one end of the circuit board grounding circuit is electrically connected with one end of the module grounding circuit, the other end of the circuit board grounding circuit is provided with a grounding interface, and the circuit board grounding circuit is arranged on a flexible circuit board connected with the module body; the grounding module is electrically connected with the grounding circuit of the circuit board and is used for being arranged on the flexible circuit board; one end of the circuit board test circuit is electrically connected with the other end of the module grounding circuit, and the other end of the circuit board test circuit is provided with a test interface. Because chip drive interface, test interface, ground connection interface all locate on the flexible circuit board, adopt module function tester to detect easily, improved the detection efficiency who shows detection circuitry.
Description
Technical Field
The invention relates to the technical field of manufacturing of liquid crystal display equipment, in particular to a liquid crystal display module and a display detection circuit thereof.
Background
In order to improve the anti-static discharge capability of the liquid crystal display module, a grounding wire for anti-static discharge is additionally designed on the periphery of the liquid crystal display module. When static electricity is released, the static electricity can be released along the grounding lines around the module, so that the problem that the circuit inside the module is damaged by the static electricity to cause poor display of the module is avoided.
However, in the production process of the liquid crystal display module, cracks exist at the edge of the glass of the module inevitably, or cracks exist in the flexible circuit board of the liquid crystal display module, so that the anti-static discharge circuit of the module may have an open circuit fault problem, even if the display circuit of the liquid crystal display module has the condition that the anti-static discharge capability is reduced or even the display circuit of the liquid crystal display module fails. The traditional display detection circuit of the liquid crystal display module has lower detection efficiency and reliability, and for the condition of batch production of the liquid crystal display module, the qualification rate of the display detection circuit can be detected only by sampling to judge whether the batch liquid crystal display module meets the factory requirements or not, and each liquid crystal display module can not be detected, so that the cracks of the liquid crystal display module with reduced antistatic release capacity or even failure can increase and damage a main line or an antistatic circuit in the use process of a user, and the service life of the liquid crystal display module is shorter.
Disclosure of Invention
Therefore, it is necessary to provide a liquid crystal display module and a display detection circuit thereof aiming at the problems of low detection efficiency and low reliability of the display detection circuit of the liquid crystal display module.
A display detection circuit comprising:
the module grounding circuit is arranged on the module body;
one end of the circuit board grounding circuit is electrically connected with one end of the module grounding circuit, the other end of the circuit board grounding circuit is provided with a grounding interface, and the circuit board grounding circuit is arranged on a flexible circuit board connected with the module body;
the grounding module is electrically connected with the grounding circuit of the circuit board and is used for being arranged on the flexible circuit board;
one end of the circuit board testing circuit is electrically connected with the other end of the module grounding circuit, the other end of the circuit board testing circuit is provided with a testing interface, and the circuit board testing circuit is arranged on the flexible circuit board;
one end of the auxiliary detection circuit is electrically connected with the circuit board test circuit, the other end of the auxiliary detection circuit is electrically connected with the chip driving interface, and the auxiliary detection circuit is arranged on the flexible circuit board; and
and the resistor R2 is arranged on the auxiliary detection circuit.
In one embodiment, the sum of the resistances of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is variable; for liquid crystal display modules with different cracks, especially for the condition that the modules are not completely disconnected; the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is different when the disconnection depths are different, namely the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is variable; during detection, the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is set to be within an allowable range value, so that the tested voltage value U1 is OK within the corresponding range value, namely the liquid crystal display module with the voltage value U1 within the corresponding range value has a longer service life in the use process.
In one embodiment, the sum of the resistance values of the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is greater than a preset threshold value.
In one embodiment, the difference between the sum of the resistance values of the module ground circuit, the circuit board ground circuit and the circuit board test circuit and the resistance value of the resistor R2 is zero, that is, the sum of the resistance values of the module ground circuit, the circuit board ground circuit and the circuit board test circuit is equal to the resistance value of the resistor R2, so that the voltage value U1 is equal to 1/2 of the input voltage value U2, the numerical calculation of the display detection circuit is facilitated, and the detection efficiency of the display detection circuit is further improved.
In one embodiment, the display detection circuit further comprises an electrostatic discharge circuit and a bidirectional diode, two ends of the electrostatic discharge circuit are respectively electrically connected with the circuit board grounding circuit and the circuit board testing circuit, and the bidirectional diode is arranged on the electrostatic discharge circuit; when the display detection circuit is detected to meet the condition of electrostatic discharge, the static electricity is connected into the grounding module through the electrostatic discharge circuit and the circuit board grounding circuit to be discharged, so that the module body or the module function tester is prevented from being damaged by the electrostatic discharge; because the static electricity discharge circuit is provided with the bidirectional diode, the static electricity can only be connected into the grounding module along the method of the static electricity discharge circuit and the circuit board grounding circuit.
A liquid crystal display module comprises a module body, a flexible circuit board, a chip driving interface and the display detection circuit of any embodiment; the module body is connected with the flexible circuit board, and the module grounding circuit is arranged on the module body; the circuit board grounding circuit, the grounding module and the circuit board testing circuit are all arranged on the flexible circuit board; the chip driving interface is electrically connected with the auxiliary detection circuit; the auxiliary detection circuit is arranged on the flexible circuit board.
In one embodiment, the module grounding circuit is disposed at the periphery of the module body, so that the internal circuit of the module body has a larger layout space, and whether the module body is damaged or not can be obtained by detecting the voltage value U1.
In one embodiment, the test interface is arranged at the end part of the flexible circuit board far away from the module body, so that the module function tester can detect the module function tester through the test interface.
In one embodiment, the grounding interface is arranged at the end part of the flexible circuit board far away from the module body, so that the module function tester can detect the module function through the grounding interface.
In one embodiment, the connection position of the grounding module and the circuit board grounding circuit is located at the interface of the flexible circuit board, so that the circuit board grounding circuit is connected with the peripheral grounding line of the whole flexible circuit board as much as possible, and the detection reliability of the display detection circuit is further improved.
In the liquid crystal display module and the display detection circuit thereof, the module grounding circuit is arranged on the module body, the circuit board grounding circuit is arranged on the flexible circuit board and is electrically connected with the module grounding circuit, the circuit board test circuit is arranged on the flexible circuit board and is electrically connected with the module grounding circuit, so that the circuit board test circuit is electrically connected with the circuit board grounding circuit through the module grounding circuit, and the other end of the circuit board grounding circuit is provided with the grounding interface, namely the grounding module which is electrically connected with the circuit board grounding circuit is arranged on the flexible circuit board and is also provided with the grounding interface so as to detect whether the electrostatic discharge circuit is OK or not; during detection, firstly, detecting the voltage corresponding to the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board test circuit through a grounding interface, namely detecting the voltage between the grounding interface and the test interface by using a module function tester to obtain the voltage value corresponding to the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board test circuit, and simultaneously obtaining the voltage value U1 at the test interface; the resistances in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit can be equivalent to a resistor R1, and the voltage at two ends of the resistor R1 is U1; when the same batch of liquid crystal display modules of the same type are detected, the voltage value U1 is a constant value and only needs to be detected once, so that whether the module body has cracks or whether the flexible circuit board is torn or not is judged; the chip driving interface, the test interface and the grounding interface are all arranged on the flexible circuit board, so that the module function tester is easy to detect, and the detection efficiency of the display detection circuit is improved; for a product of the same model, the resistor R1 and the resistor R2 are both constant and known, and the input voltage value of the chip driving interface is constant IOVCC, namely U2; if the voltage value U1 is IOVCC R1/(R1 + R2) V, it can be known that the voltage value U1 is OK, i.e., the circuit board test circuit, the module grounding circuit, and the circuit board grounding circuit are all OK; otherwise, according to the resistance formula R = ρ × L/S, when a product has a defect crack, that is, when a module body has a crack or a flexible printed circuit board has a tear, which is equivalent to a decrease in the cross-sectional area S, so that R1 is increased, U1= IOVCC R1/(R1 + R2) = IOVCC-IOVCC R2/(R1 + R2) is also increased, and the worst case is that a peripheral crack of the module body causes a complete opening of a module ground line, which is equivalent to an infinite R1, so that U1 reaches the maximum IOVCC, and it can be set to NG when U1 is greater than a certain value, that is, the circuit board test line, the module ground line, and the circuit board ground line are partially NG, so that whether the voltage value U1 is OK can be accurately known, and the inspection reliability of the display detection circuit is improved.
Drawings
FIG. 1 is a schematic diagram of a display detection circuit disposed in a liquid crystal display module according to an embodiment;
FIG. 2 is a partial schematic diagram of the display detection circuit of FIG. 1;
FIG. 3 is a schematic diagram of a conventional display detection circuit disposed in a liquid crystal display module;
FIG. 4 is a partial schematic diagram of the display detection circuit shown in FIG. 3;
FIG. 5 is a schematic diagram showing a circuit model of a detection circuit according to an embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the liquid crystal display module and the display detection circuit thereof will be described more fully with reference to the accompanying drawings. The preferred embodiments of the liquid crystal display module and the display detection circuit thereof are shown in the attached drawings. However, the liquid crystal display module and the display detection circuit thereof can be implemented in many different forms and are not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the liquid crystal display module and the display sensing circuit thereof is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment, a display detection circuit includes a module grounding circuit, a circuit board grounding circuit, a grounding module, a circuit board test circuit, an auxiliary detection circuit and a resistor R2; the module grounding circuit is arranged on the module body; one end of the circuit board grounding circuit is electrically connected with one end of the module grounding circuit, the other end of the circuit board grounding circuit is provided with a grounding interface, and the circuit board grounding circuit is arranged on a flexible circuit board connected with the module body; the grounding module is electrically connected with the grounding circuit of the circuit board and is used for being arranged on the flexible circuit board; one end of the circuit board test circuit is electrically connected with the other end of the module grounding circuit, the other end of the circuit board test circuit is provided with a test interface, and the circuit board test circuit is arranged on the flexible circuit board; one end of the auxiliary detection circuit is electrically connected with the circuit board test circuit, the other end of the auxiliary detection circuit is electrically connected with the chip driving interface, and the auxiliary detection circuit is arranged on the flexible circuit board; the resistor R2 is arranged on the auxiliary detection circuit.
As shown in fig. 1 and fig. 2, a display detection circuit 100 includes a module ground circuit 110, a circuit board ground circuit 120, a ground module 130, a circuit board test circuit 140, an auxiliary detection circuit 150, and a resistor R2.
The module ground line 110 is disposed on the module body 200. One end of the circuit board grounding circuit 120 is electrically connected to one end of the module grounding circuit 110, and the other end of the circuit board grounding circuit 120 is provided with a grounding interface 122, so that the module grounding circuit is grounded through the grounding interface. The circuit board ground circuit 120 is disposed on the flexible circuit board 300 connected to the module body 200. The grounding module 130 is electrically connected to the circuit board grounding circuit 120, so that the circuit board grounding circuit can be grounded through the grounding module. The grounding module 130 is disposed on the flexible circuit board 300.
One end of the circuit board test circuit 140 is electrically connected to the other end of the module ground circuit 110, and the other end of the circuit board test circuit 140 is provided with a test interface 142, so that the module ground circuit is electrically connected to the test interface through the circuit board test circuit. Compared with the traditional display detection circuit, the display detection circuit has the advantages that the test interface is added, and batch detection is facilitated. The circuit board test circuit 140 is disposed on the flexible circuit board 300. In this embodiment, the module grounding circuit, the circuit board grounding circuit, and the circuit board testing circuit all have resistors, which can be equivalent to a resistor R1, and the voltage at the two ends of the resistor R1 is U1. One end of the auxiliary detection circuit 150 is electrically connected to the circuit board test circuit 140, and the other end of the auxiliary detection circuit 150 is electrically connected to the chip driving interface 400, so that the circuit board test circuit is electrically connected to the chip driving interface through the auxiliary detection circuit. The auxiliary detection circuit 150 is disposed on the flexible circuit board 300. The resistor R2 is disposed on the auxiliary detection line 150.
As shown in fig. 3 and 4, compared to the single grounding module 21 of the conventional display detection circuit 20, the display detection circuit 100 includes two parts, namely, the circuit board grounding circuit 120 and the grounding module 130, so that the display detection circuit can be better arranged. The circuit board ground circuit 120 is a peripheral circuit of the module body, i.e., a peripheral GND circuit. The grounding module 130 is an inner peripheral circuit of the module body, i.e., an inner GND module circuit. The grounding part of the circuit board of the traditional module is a whole, and the GND designed on the circuit board is a whole.
According to the liquid crystal display module and the display detection circuit thereof, the module grounding circuit is arranged on the module body, the circuit board grounding circuit is arranged on the flexible circuit board and is electrically connected with the module grounding circuit, the circuit board test circuit is arranged on the flexible circuit board and is electrically connected with the module grounding circuit, so that the circuit board test circuit is electrically connected with the circuit board grounding circuit through the module grounding circuit, and the other end of the circuit board grounding circuit is provided with the grounding interface, namely the grounding module which is electrically connected with the circuit board grounding circuit is arranged on the flexible circuit board and is also provided with the grounding interface so as to detect whether the electrostatic discharge circuit is OK or not.
FIG. 5 is a schematic diagram showing a circuit model of a detection circuit according to an embodiment. During detection, firstly, detecting the voltage corresponding to the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board test circuit, namely the voltage at two ends of the resistor R1 through a grounding interface, namely detecting the voltage between the grounding interface and the test interface by using a module function tester to obtain the voltage value at two ends of the resistor R1, namely obtaining the voltage value corresponding to the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board test circuit, and simultaneously obtaining the voltage value U1 at the test interface; when the same batch of liquid crystal display modules of the same model are detected, the voltage value U1 is a constant value and only needs to be detected once, and as the chip driving interface is an input signal interface of the driving voltage of the display panel of the existing liquid crystal display module, the number of interfaces of the flexible circuit board is reduced, so that the structure of the flexible circuit board is more compact; and finally, judging whether the module body has cracks or whether the flexible circuit board is torn according to the fact whether the voltage value U1 is OK or not.
Because chip drive interface, test interface, ground connection interface all locate on the flexible circuit board, adopt module function tester to detect easily, improved the detection efficiency who shows detection circuitry. For the same model product, the resistor R1 and the resistor R2 are both constant and known, and the input voltage value of the chip driving interface 400 is always IOVCC, i.e., U2. If the voltage value U1 is IOVCC R1/(R1 + R2) V, it can be known that the voltage value U1 is OK, i.e., the circuit board test circuit, the module grounding circuit, and the circuit board grounding circuit are all OK; otherwise, according to the resistance formula R = ρ × L/S, when the product has a defect crack, that is, when the module body has a crack or the flexible printed circuit board has a tear, which is equivalent to a decrease in the cross-sectional area S, so that R1 is increased, U1= IOVCC R1/(R1 + R2) = IOVCC-IOVCC R2/(R1 + R2) is also increased, and the worst case is that the peripheral crack of the module body causes the module ground line to be completely opened, which is equivalent to an infinite R1, so that U1 reaches the maximum IOVCC, and it may be set to be NG (Not Good) when U1 is greater than a certain value, that is, where the circuit board test line, the module ground line, and the circuit board ground line have NG, so that whether the voltage value U1 is OK can be accurately known, and the inspection reliability of the display detection circuit is improved.
In one embodiment, the sum of the resistances of the resistors in the module ground circuit, the circuit board ground circuit and the circuit board test circuit is variable, that is, the resistor R1 is a variable resistor. The liquid crystal display module with different cracks is particularly not completely disconnected. The sum of the resistances of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board test circuit is different when the disconnection depths are different, that is, the sum of the resistances of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board test circuit is variable, that is, the value of the resistor R1 is different, that is, the resistor R1 is a variable resistor. It can be understood that the larger the die defect, the larger the R1 resistance. During detection, the sum of the resistance values of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is set to be within an allowable range value, so that the voltage value U1 obtained through testing is OK within the corresponding range value, namely, the liquid crystal display module with the voltage value U1 within the corresponding range value has a better service life in the use process, and the qualified requirement of the liquid crystal display module is met.
In one embodiment, the sum of the resistance values of the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is less than or equal to a preset threshold, that is, the value of the resistor R1 is less than or equal to the preset threshold, and at this time, the module body is OK. If the value of the resistor R1 is greater than the preset threshold value, the module body is NG. In one embodiment, the preset threshold is 50K Ω. In one embodiment, the sum of the resistances of the resistors in the module ground line, the circuit board ground line and the circuit board test line ranges from 1K Ω to 50K Ω, that is, the resistor R1 ranges from 1K Ω to 50K Ω. And aiming at the same product, the resistor R1 is a fixed value, when the difference between the value of the resistor R1 when the product has defects and the normal value of the resistor R1 is smaller, when the product has defects, the value of the resistor R1 is generally in a trend of increasing compared with the normal value, and the tested voltage value U1 is OK in a corresponding range, namely the liquid crystal display module with the voltage value U1 in the corresponding range has better service life in the using process. In this embodiment, the voltage value U1 is greater than or equal to IOVCC R1/(R1 + R2) is OK, otherwise NG. It is understood that in other embodiments, the preset threshold is not limited to 50K Ω, and the preset threshold may be different for different products, i.e. the preset threshold may be greater than 50K Ω, or less than 50K Ω.
In one embodiment, the sum of the resistances of the resistors in the module grounding circuit, the circuit board grounding circuit and the circuit board testing circuit is equal to the resistance of the resistor R2, that is, the value of the resistor R1 is equal to the value of the resistor R2, so that the testing voltage U1 is equal to 1/2 of the IOVCC, which facilitates the numerical calculation of the display detection circuit and further improves the detection efficiency of the display detection circuit. In other embodiments, the value of the resistor R1 may not be equal to the value of the resistor R2, and the value of the resistor R1 may also be close to the value of the resistor R2, but the value of the resistor R1 is greater than or less than the value of the resistor R2.
In one embodiment, the range of the IOVCC is 1.8V to 3.3V, and since the value of R1 is equal to the value of R2, the range of the voltage U1 is 0.9V to 1.65V. Assuming that IOVCC is chosen to be 1.8V and the R1 value was found to be 5K Ω, R1 values greater than 15K Ω were considered unacceptable or too risky, then the R2 design choice was also 5K Ω. The normal module U1= IOVCC R1/(R1 + R2) = IOVCC/2=0.9v, and the critical product voltage is U1= IOVCC R1/(R1 + R2) =1.8 + 15/(5 + 15) =1.35V, at this time, the maximum threshold value of U1 may be set to 1.35V, and when U1>1.35, the product NG is performed.
As shown in FIG. 2, in one embodiment, the display detection circuit 100 further includes an electrostatic discharge circuit 160 and a bidirectional diode 170. Both ends of the electrostatic discharge circuit 160 are electrically connected to the circuit board ground circuit 120 and the circuit board test circuit 140, respectively. The bidirectional diode 170 is disposed on the electrostatic discharge circuit 160. When the display detection circuit is detected to meet the condition of electrostatic discharge, the static electricity can be connected into the grounding module through the electrostatic discharge circuit and the circuit board grounding circuit to be discharged, and the module body or the module function tester is prevented from being damaged by the electrostatic discharge. Because the static electricity discharge circuit is provided with the bidirectional diode, the static electricity can only be connected into the grounding module along the method of the static electricity discharge circuit and the circuit board grounding circuit.
Referring to fig. 2 again, the present invention further provides a liquid crystal display module 10. The liquid crystal display module 10 includes a module body 200, a flexible circuit board 300, a chip driving interface 400 and the display detection circuit 100 according to any of the embodiments. The module body 200 is connected to the flexible circuit board 300. The module ground line 110 is provided on the module body 200. The circuit board grounding circuit 120, the grounding module 130 and the circuit board testing circuit 140 are all disposed on the flexible circuit board 300. The chip driving interface 400 is electrically connected to the auxiliary detection line 150. The auxiliary detection circuit 150 is disposed on the flexible circuit board 300.
In one embodiment, the module ground line 110 is disposed at the periphery of the module body 200, so that the internal circuit of the module body has a larger layout space, and whether the module body is damaged can be obtained by detecting the voltage value U1. It is understood that in other embodiments, the module ground line is not limited to be disposed on the periphery of the module body, but may be disposed inside the module body.
In one embodiment, the circuit board grounding circuit 120 is disposed on the periphery of the flexible circuit board 300, so that the circuit board grounding circuit is connected with the grounding wires on the periphery of the whole flexible circuit board as much as possible, and the flexible circuit board has a larger layout space inside. Further, the circuit board test circuit 140 is disposed on the periphery of the flexible circuit board 300, so that the circuit board test circuit is connected to the ground line on the periphery of the entire flexible circuit board as much as possible, and also allows a larger layout space inside the flexible circuit board.
To facilitate the module function tester to perform testing through the testing interface, in one embodiment, the testing interface 142 is disposed at an end of the flexible circuit board 300 away from the module body 200, so that the module function tester performs testing through the testing interface.
In order to facilitate the detection of the module function tester through the ground interface, in one embodiment, the ground interface 122 is disposed at an end of the flexible circuit board 300 away from the module body 200, so that the module function tester can detect through the ground interface.
In one embodiment, the connection between the grounding module 130 and the circuit board grounding circuit 120 is located at the interface of the flexible circuit board 300. Compared with a single grounding module of a traditional display detection circuit, the display detection circuit comprises a circuit board grounding circuit and a grounding module, and the circuit board grounding circuit and the grounding module are connected together at the interface of the flexible circuit board, so that the circuit board grounding circuit is connected with the peripheral grounding wire of the whole flexible circuit board as much as possible, the detection reliability of the display detection circuit is further improved, and the display detection circuit can be better arranged.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A display detection circuit, comprising:
the module grounding circuit is arranged on the module body;
one end of the circuit board grounding circuit is electrically connected with one end of the module grounding circuit, the other end of the circuit board grounding circuit is provided with a grounding interface, and the circuit board grounding circuit is arranged on a flexible circuit board connected with the module body;
the grounding module is electrically connected with the grounding circuit of the circuit board and is used for being arranged on the flexible circuit board; the connection position of the grounding module and the grounding circuit of the circuit board is positioned at the interface of the flexible circuit board;
one end of the circuit board test circuit is electrically connected with the other end of the module grounding circuit, the other end of the circuit board test circuit is provided with a test interface, and the circuit board test circuit is arranged on the flexible circuit board;
one end of the auxiliary detection circuit is electrically connected with the circuit board test circuit, the other end of the auxiliary detection circuit is electrically connected with the chip driving interface, and the auxiliary detection circuit is arranged on the flexible circuit board; the chip driving interface is arranged on the flexible circuit board; and
and the resistor R2 is arranged on the auxiliary detection circuit.
2. The display detection circuit of claim 1, wherein a sum of resistances of resistors in the module ground line, the circuit board ground line, and the circuit board test line is variable.
3. The display detection circuit of claim 1, wherein a sum of resistance values in the module ground line, the circuit board ground line, and the circuit board test line is greater than a preset threshold.
4. The display detection circuit of claim 1, wherein the difference between the sum of the resistances of the resistors in the module ground line, the circuit board ground line, and the circuit board test line and the resistance of the resistor R2 is zero.
5. The display detection circuit according to any one of claims 1 to 4, further comprising an electrostatic discharge circuit and a bidirectional diode, wherein two ends of the electrostatic discharge circuit are electrically connected to the circuit board ground line and the circuit board test line, respectively, and the bidirectional diode is disposed on the electrostatic discharge circuit.
6. A liquid crystal display module, comprising a module body, a flexible circuit board, a chip driving interface and the display detection circuit of any one of claims 1 to 5; the module body is connected with the flexible circuit board, and the module grounding circuit is arranged on the module body; the circuit board grounding circuit, the grounding module and the circuit board testing circuit are all arranged on the flexible circuit board; the chip driving interface is electrically connected with the auxiliary detection circuit; the auxiliary detection circuit is arranged on the flexible circuit board.
7. The LCD module of claim 6, wherein the module ground trace is disposed at the periphery of the module body.
8. The LCD module of claim 6, wherein the test interface is disposed at an end of the flexible circuit board away from the module body.
9. The LCD module of claim 6, wherein the ground interface is disposed at an end of the flexible circuit board away from the module body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811385685.0A CN109597223B (en) | 2018-11-20 | 2018-11-20 | Liquid crystal display module and display detection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811385685.0A CN109597223B (en) | 2018-11-20 | 2018-11-20 | Liquid crystal display module and display detection circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109597223A CN109597223A (en) | 2019-04-09 |
| CN109597223B true CN109597223B (en) | 2022-10-28 |
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| CN111445797B (en) * | 2020-04-07 | 2023-06-30 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN111462692B (en) * | 2020-05-15 | 2022-03-01 | 京东方科技集团股份有限公司 | Driving circuit, restarting method thereof and display device |
| CN111508401A (en) * | 2020-06-12 | 2020-08-07 | 京东方科技集团股份有限公司 | Crack detection circuit, display panel and crack detection method |
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