CN109102767B - Impedance detection circuit and liquid crystal display device - Google Patents
Impedance detection circuit and liquid crystal display device Download PDFInfo
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- CN109102767B CN109102767B CN201810971474.9A CN201810971474A CN109102767B CN 109102767 B CN109102767 B CN 109102767B CN 201810971474 A CN201810971474 A CN 201810971474A CN 109102767 B CN109102767 B CN 109102767B
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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 provides an impedance detection circuit which comprises a first switch element, a second switch element, a detection unit and a processing unit. The first control end of the first switch element receives a first control signal, the first path end of the first switch element is grounded through the first detection resistor, and the second path end of the first switch element is connected with the detection power supply. The second control end of the second switch element receives the second control signal, the third path end of the second switch element is grounded through the second detection resistor, and the fourth path end of the second switch element is connected with the second path end. The first control signal is an enabling signal, the second control signal is a PWM signal, and the processing unit collects output signals of the detection power supply through the detection unit to judge the resistance values of the first detection resistor and the second detection resistor. The invention also provides a liquid crystal display device. The impedance detection circuit and the liquid crystal display device can be used for automatic detection of binding of a flexible circuit board, and can also expand the sampling range by changing the duty ratio coefficient of a PWM signal, so that the sampling accuracy is improved.
Description
Technical Field
The invention relates to the field of detection of display panels, in particular to an impedance detection circuit and a liquid crystal display device.
Background
Flat panel displays, such as Liquid Crystal Displays (LCDs), have been gradually replacing conventional Cathode Ray Tube (CRT) displays due to their advantages of being light, thin, energy-saving, and non-radiative, and are widely used in electronic devices, such as high-definition digital televisions, desktop computers, Personal Digital Assistants (PDAs), notebook computers, mobile phones, and digital cameras.
The liquid crystal display device includes a display panel, a driving Circuit, a Flexible Printed Circuit Board (FPC), and a Printed Circuit Board (PCB), wherein the driving Circuit is disposed on the display panel and configured to provide a data signal and a scanning signal to each pixel in the display panel to drive the display panel to display a picture, and the Printed Circuit Board is connected to the display panel through the Flexible Printed Circuit Board to provide a common voltage, a gray scale voltage of red, green, and blue pixels, and a timing sequence of operation of the driving Circuit to the display panel, so that a quality of a binding (binding) between the driving Circuit and the Flexible Printed Circuit Board and a quality of a binding between the Flexible Printed Circuit Board and the Flexible Printed Circuit Board are particularly important for the liquid crystal display device.
At present, in order to measure whether the binding of the flexible circuit board is qualified, a mode of measuring the impedance of the binding position is generally adopted, specifically, a test point is reserved on the printed circuit board, the test point is manually measured through a universal meter, and whether the binding of the flexible circuit board is qualified is determined according to a numerical value displayed by the universal meter. However, this manual measurement is inefficient and prone to false detection or missing.
Disclosure of Invention
In view of the above, the present invention provides an impedance detection circuit, which can detect the binding quality with high efficiency and high detection accuracy.
Specifically, an embodiment of the present invention provides an impedance detection circuit, which includes a first switching element, a second switching element, a detection unit, and a processing unit. The first switch element comprises a first control end, a first path end and a second path end, the first control end of the first switch element receives a first control signal, the first path end of the first switch element is grounded through a first detection resistor, and the second path end of the first switch element is connected with a detection power supply. The second switch element comprises a second control end, a third path end and a fourth path end, the second control end of the second switch element receives a second control signal, the third path end of the second switch element is grounded through a second detection resistor, and the fourth path end of the second switch element is connected with the second path end of the first switch element. The processing unit comprises a first output end, a second output end and a detection input end, the first output end outputs the first control signal, the second output end outputs the second control signal, and the detection input end is connected with the detection power supply through the detection unit. The first control signal is an enable signal, the second control signal is a PWM signal, and the processing unit collects output signals of the detection power supply through the detection unit to judge the resistance values of the first detection resistor and the second detection resistor.
Further, the processing unit adjusts a duty ratio coefficient of the PWM signal.
Further, the detection power supply is a direct current source, and the detection unit collects the voltage of an output signal of the detection power supply.
Further, the detection unit includes a voltage amplifier.
Further, the detection power supply is a direct-current voltage source, and the detection unit collects current of an output signal of the detection power supply.
Further, the first detection resistor and the second detection resistor are connected with the detection power supply through the detection unit.
Further, the first switch element and the second switch element are both NMOS transistors.
The embodiment of the invention also provides a display panel, which comprises a printed circuit board and a flexible circuit board connected with the printed circuit board, and is characterized in that the liquid crystal display device comprises the impedance detection circuit, and two binding impedances formed at two binding positions of the flexible circuit board and the printed circuit board are defined as the first detection resistor and the second detection resistor.
Furthermore, a connector is arranged on the printed circuit board, the first control end of the first switch element is connected with the processing unit through the connector, the second control end of the second switch element is connected with the processing unit through the connector, and the second path end of the first switch element is connected with the detection power supply through the connector.
Further, the impedance detection circuit communicates with an external device through an external interface.
According to the impedance detection circuit and the liquid crystal display device provided by the invention, the first control signal is an enable signal, the second control signal is a PWM signal, the processing unit collects the output signal of the detection power supply through the detection unit to judge the resistance values of the first detection resistor and the second detection resistor, the impedance detection circuit and the liquid crystal display device can be used for automatic detection of binding of a flexible circuit board, and the duty ratio coefficient of the PWM signal can be changed to expand the sampling range, so that the sampling accuracy is improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a circuit connection diagram of an impedance detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an lcd device according to an embodiment of the invention;
fig. 3 is a circuit connection diagram of an impedance detection circuit according to a second embodiment of the present invention;
fig. 4 is a circuit connection diagram of a liquid crystal display device according to a second embodiment of the invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given to specific embodiments, methods, steps, structures, features and effects of the impedance detection circuit and the liquid crystal display device according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.
First embodiment
Fig. 1 is a circuit connection diagram of an impedance detection circuit according to an embodiment of the present invention.
As shown in fig. 1, the impedance detecting circuit of the present embodiment includes a first switching element T1, a second switching element T2, a detecting unit 130, and a processing unit 120. The first switching element T1 includes a first control terminal, a first path terminal and a second path terminal, the first control terminal of the first switching element T1 receives the first control signal, the first path terminal of the first switching element T1 is grounded through the first sensing resistor R1, and the second path terminal of the first switching element T1 is connected to the sensing power supply 110. The second switching element T2 includes a second control terminal, a third path terminal and a fourth path terminal, the second control terminal of the second switching element T2 receives the second control signal, the third path terminal of the second switching element T2 is grounded through the second sensing resistor R2, the fourth path terminal of the second switching element T2 is connected to the second path terminal of the first switching element T1, and the fourth path terminal of the second switching element T2 is connected to the sensing power supply 110. The processing unit 120 includes a first output terminal 121, a second output terminal 122 and a detection input terminal 123, the first output terminal 121 outputs a first control signal, the second output terminal 122 outputs a second control signal, and the detection input terminal 123 is connected to the detection power supply 110 through the detection unit 130. In the embodiment, the detecting power source 110 is a dc current source, the current of the output signal is fixed, and the voltage of the output signal is proportional to the total resistance of the circuit connected thereto. Wherein, the first control signal is an enable signal, the second control signal is a PWM signal, the current magnitude of the output signal of the detection power supply 110 is not changed, but there is a corresponding total resistance in the corresponding first control signal and second control signal, and the processing unit 120 collects the output signal of the detection power supply 110 through the detection unit 130 to determine the resistance magnitudes of the first detection resistor R1 and the second detection resistor R2.
In an embodiment, the processing unit 120 may adjust a duty ratio coefficient of the PWM signal to extend a sampling range, so that sampling accuracy is improved.
In an embodiment, the detection unit 130 may include a voltage amplifier.
In an embodiment, the first switching element T1 and the second switching element T2 may be both NMOS transistors, but the invention is not limited to the types of the first switching element T1 and the second switching element T2, and in other embodiments, the first switching element T1 and/or the second switching element T2 may be NPN transistors, PMOS transistors, PNP transistors, or the like. Hereinafter, the first switching element T1 and the second switching element T2 are both NMOS transistors as an example.
Specifically, the first output terminal 121 of the processing unit 120 outputs a first control signal to the first control terminal of the first switch element T1, and the second output terminal 122 of the processing unit 120 outputs a second control signal to the second control terminal of the second switch element T2, wherein the first control signal is an enable signal and the second control signal is a PWM signal. The first switching element T1 turns on or off the first and second path terminals of the first switching element T1 according to the high-low level state of the first control signal, and the second switching element T2 turns on or off the third and fourth path terminals of the second switching element T2 according to the high-low level state of the second control signal. The second control signal is a PWM signal, which can control the detection power supply 110 to output the output current of the second detection resistor R2 through the second switch element T2, while the first control signal is an enable signal, whose high-low level state will control whether the first detection resistor R1 is connected to the detection power supply 110, and the processing unit 120 can determine the resistance values of the first detection resistor R1 and the second detection resistor R2 by the detection unit 130 collecting the voltage of the output signal of the detection power supply 110.
Specifically, when the second control signal is the PWM signal and when the first control signal is the enable signal and is in the low state, the first switch element T1 may disconnect the first path terminal and the second path terminal, the first detection resistor R1 and the detection power source 110 are disconnected, the fixed current of the detection power source 110 is not shunted by the first detection resistor R1, and the current on the second detection resistor R2 is relatively large. The processing unit 120 may determine the magnitude of the second detection resistor R2 by collecting, by the detection unit 130, that the voltage of the output signal of the detection power supply 110 is the voltage of the second detection resistor R2, for example, if the voltage of the output signal of the detection power supply 110 is greater than a preset voltage threshold, the resistance of the second detection resistor R2 is too large, or the magnitude of the total resistance is obtained by dividing the voltage by the magnitude of the output current of the dc source, and the magnitude of the total resistance is the magnitude of the resistance of the second detection resistor R2, and the magnitude of the resistance may be further compared with a resistance threshold to determine whether the second detection resistor R2 is too large. When the second control signal is the PWM signal and when the first control signal is the enable signal and is in the high state, the first switch device T1 can turn on the first path terminal and the second path terminal, the first detection resistor R1 and the detection power source 110 are turned on, and at this time, the fixed current of the detection power source 110 is shunted by the first detection resistor R1, and the current on the second detection resistor R2 is relatively small. The second control signal controls the output current of the second detection resistor R2, and the processing unit 120 collects the voltage of the output signal of the detection power supply 110 through the detection unit 130, so as to determine the total resistance, i.e., the magnitude of the first detection resistor R1 connected in parallel with the second detection resistor R2, for example, if the voltage of the output signal of the detection power supply 110 is greater than a preset voltage threshold, the parallel resistance of the first detection resistor R1 and the second detection resistor R2 is too large, or the magnitude of the total resistance obtained by dividing the voltage by the magnitude of the output current of the detection power supply 110 is the magnitude of the parallel resistance of the first detection resistor R1 and the second detection resistor R2, which can be further compared with a resistance threshold; further, the voltage values measured in the high and low states of the first control signal may be compared to determine the resistance of the first detection resistor R1, for example, if the voltage variation amplitude is small, the resistance of the first detection resistor R1 is too large.
The impedance detection circuit of this embodiment may also be connected to the external device 200, for example, the processing unit 120 is connected to the external device 200 through an external interface (e.g., a USB serial port) for communication, and then the processing unit 120 may change the first control signal and the second control signal through itself or the external device 200, for example, change a duty ratio coefficient of the second control signal, that is, a PWM signal, to further extend a sampling range. The external device 200 may also be a display device, and may process and display the output signal of the detection power supply 110 collected by the processing unit 120 through the detection unit 130; the external device 200 may also be an alarm device or the like.
In the impedance detection circuit of this embodiment, the first control signal is an enable signal, the second control signal is a PWM signal, the processing unit 120 collects the output signal of the detection power supply 110 through the detection unit 130 to determine the magnitudes of the resistances of the first detection resistor R1 and the second detection resistor R2, and the duty ratio of the PWM signal can be changed to expand the sampling range, so that the sampling accuracy is improved.
Fig. 2 is a circuit connection diagram of a liquid crystal display device according to an embodiment of the invention.
The embodiment provides a liquid crystal display device, which comprises a printed circuit board 300, a flexible circuit board 400 connected with the printed circuit board 300 and an impedance detection circuit. The impedance detection circuit of the present embodiment is substantially the same as the impedance detection circuit of the first embodiment, except that: two-point bonding impedance formed by two-point bonding of the flexible circuit board 400 and the printed circuit board 300 is defined as a first detection resistor R1 and a second detection resistor R2.
The flexible printed circuit board 400 may further connect the printed circuit board 300 to the display panel 500, and the display panel 500 may be provided with a driving circuit 510, and it is understood that the binding impedance at the binding position may be an impedance of the printed circuit board 300 connected to the display panel 500 through the flexible printed circuit board 400, or an impedance of the printed circuit board 300 connected to the driving circuit 510 of the display panel 500 through the flexible printed circuit board 400.
In one embodiment, the printed circuit board 300 is provided with a connector 310, a first control terminal of the first switching element T1 is connected to the processing unit 120 through the connector 310, a second control terminal of the second switching element T2 is connected to the processing unit 120 through the connector 310, and a second path terminal of the first switching element T1 is connected to the detection power source 110 through the connector 310.
In one embodiment, the impedance detection circuit communicates with the external device 200 through an external interface.
According to the liquid crystal display device provided by the invention, the first control signal is an enable signal, the second control signal is a PWM signal, the processing unit 120 collects the output signal of the detection power supply 110 through the detection unit 130 to judge the resistance values of the first detection resistor R1 and the second detection resistor R2, the liquid crystal display device can be used for automatic detection of binding of the flexible circuit board 400, and the duty ratio coefficient of the PWM signal can be changed to expand the sampling range, so that the sampling accuracy is improved.
Second embodiment
Fig. 3 is a circuit connection diagram of an impedance detection circuit according to a second embodiment of the present invention.
This embodiment is substantially the same as the first embodiment except that: the detection power supply 110 is a dc voltage source, and the detection unit 130 collects a current of an output signal of the detection power supply 110.
In one embodiment, the first and second sensing resistors R1 and R2 are connected to the sensing power source 110 through the sensing unit 130.
Specifically, the first output terminal 121 of the processing unit 120 outputs a first control signal to the first control terminal of the first switch element T1, and the second output terminal 122 of the processing unit 120 outputs a second control signal to the second control terminal of the second switch element T2, wherein the first control signal is an enable signal and the second control signal is a PWM signal. The first switching element T1 turns on or off the first and second path terminals of the first switching element T1 according to the high-low level state of the first control signal, and the second switching element T2 turns on or off the third and fourth path terminals of the second switching element T2 according to the high-low level state of the second control signal. The second control signal is a PWM signal, which can control the detection power supply 110 to output the output voltage of the second detection resistor R2 through the second switch element T2, while the first control signal is an enable signal, whose high-low level state will control whether the first detection resistor R1 is connected to the detection power supply 110, and the processing unit 120 can determine the resistance values of the first detection resistor R1 and the second detection resistor R2 by the detection unit 130 collecting the voltage of the output signal of the detection power supply 110.
Specifically, when the second control signal is the PWM signal and when the first control signal is the enable signal and is in the low state, the first switch element T1 may disconnect the first path terminal and the second path terminal, the first detection resistor R1 and the detection power source 110 are disconnected, the fixed voltage of the detection power source 110 is not applied to the first detection resistor R1, and no current flows through the first detection resistor R1, so the total current is relatively small. The processing unit 120 may collect the current of the output signal of the detection power supply 110 as the current of the second detection resistor R2 through the detection unit 130, and then determine the magnitude of the second detection resistor R2, for example, if the magnitude of the current of the output signal of the detection power supply 110 is smaller than a preset current threshold, the resistance of the second detection resistor R2 is too large, or the magnitude of the output voltage of the detection power supply 110 may be divided by the magnitude of the current to obtain the magnitude of the total resistor, which is the magnitude of the resistance of the second detection resistor R2, and then the magnitude of the resistance may be further compared with a resistance threshold to determine whether the second detection resistor R2 is too large. When the second control signal is the PWM signal and when the first control signal is the enable signal and is in the high state, the first switch device T1 can turn on the first path terminal and the second path terminal, the first detection resistor R1 and the detection power source 110 are turned on, the fixed voltage of the detection power source 110 is applied to the first detection resistor R1, and the current flows through the first detection resistor R1, so the total current is relatively large. The second control signal controls the output voltage of the second detection resistor R2, and the processing unit 120 collects the current of the output signal of the detection power supply 110 through the detection unit 130, so as to determine the total resistance, i.e., the magnitude of the first detection resistor R1 connected in parallel with the second detection resistor R2, for example, if the current magnitude of the output signal of the detection power supply 110 is smaller than a preset current threshold, the parallel resistance of the first detection resistor R1 and the second detection resistor R2 is too large, or the magnitude of the dc source output voltage is divided by the current magnitude to obtain the magnitude of the total resistance, which is the magnitude of the parallel resistance of the first detection resistor R1 and the second detection resistor R2 at this time, and can be further compared with a resistance threshold; further, the value of the current measured in the high and low states of the first control signal may be compared to determine the magnitude of the resistance of the first detection resistor R1, for example, if the current variation amplitude is small, the resistance of the first detection resistor R1 is too large.
In the impedance detection circuit of this embodiment, the first control signal is an enable signal, the second control signal is a PWM signal, the processing unit 120 collects the output signal of the detection power supply 110 through the detection unit 130 to determine the magnitudes of the resistances of the first detection resistor R1 and the second detection resistor R2, and the duty ratio of the PWM signal can be changed to expand the sampling range, so that the sampling accuracy is improved.
Fig. 4 is a circuit connection diagram of a liquid crystal display device according to a second embodiment of the invention. The embodiment provides a liquid crystal display device, which comprises a printed circuit board 300, a flexible circuit board 400 connected with the printed circuit board 300 and an impedance detection circuit. The impedance detection circuit of the present embodiment is substantially the same as the impedance detection circuit of the second embodiment, except that: two-point bonding impedance formed by two-point bonding of the flexible circuit board 400 and the printed circuit board 300 is defined as a first detection resistor R1 and a second detection resistor R2.
The flexible printed circuit board 400 may further connect the printed circuit board 300 to the display panel 500, and the display panel 500 may be provided with a driving circuit 510, and it is understood that the binding impedance at the binding position may be an impedance of the printed circuit board 300 connected to the display panel 500 through the flexible printed circuit board 400, or an impedance of the printed circuit board 300 connected to the driving circuit 510 of the display panel 500 through the flexible printed circuit board 400.
In one embodiment, the printed circuit board 300 is provided with a connector 310, a first control terminal of the first switching element T1 is connected to the processing unit 120 through the connector 310, a second control terminal of the second switching element T2 is connected to the processing unit 120 through the connector 310, and a second path terminal of the first switching element T1 is connected to the detection power source 110 through the connector 310.
In one embodiment, the impedance detection circuit communicates with the external device 200 through an external interface.
According to the liquid crystal display device provided by the invention, the first control signal is an enable signal, the second control signal is a PWM signal, the processing unit 120 collects the output signal of the detection power supply 110 through the detection unit 130 to judge the resistance values of the first detection resistor R1 and the second detection resistor R2, the liquid crystal display device can be used for automatic detection of binding of the flexible circuit board 400, and the duty ratio coefficient of the PWM signal can be changed to expand the sampling range, so that the sampling accuracy is improved.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An impedance detection circuit, comprising a first switching element (T1), a second switching element (T2), a detection power supply (110), a detection unit (130), and a processing unit (120);
the first switch element (T1) comprises a first control terminal, a first pass terminal and a second pass terminal, the first control terminal of the first switch element (T1) receives a first control signal, the first pass terminal of the first switch element (T1) is grounded through a first detection resistor (R1), and the second pass terminal of the first switch element (T1) is connected with the detection power supply (110);
the second switching element (T2) includes a second control terminal, a third path terminal and a fourth path terminal, the second control terminal of the second switching element (T2) receives the second control signal, the third path terminal of the second switching element (T2) is grounded through a second detection resistor (R2), and the fourth path terminal of the second switching element (T2) is connected to the second path terminal of the first switching element (T1);
the processing unit (120) comprises a first output end (121), a second output end (122) and a detection input end (123), the first output end (121) outputs the first control signal, the second output end (122) outputs the second control signal, and the detection input end (123) is connected with the detection power supply (110) through the detection unit (130);
the first control signal is an enable signal in a high level state or an enable signal in a low level state, the second control signal is a PWM signal, and the processing unit (120) collects an output signal of the detection power supply (110) through the detection unit (130) to determine the resistance values of the first detection resistor (R1) and the second detection resistor (R2).
2. The impedance detection circuit according to claim 1, wherein the processing unit (120) adjusts a duty cycle coefficient of the PWM signal.
3. The impedance detection circuit according to claim 1, wherein the detection power supply (110) is a direct current source, and the detection unit (130) collects a voltage of an output signal of the detection power supply (110).
4. The impedance detection circuit according to claim 3, wherein the detection unit (130) comprises a voltage amplifier.
5. The impedance detection circuit according to claim 1, wherein the detection power source (110) is a direct current voltage source, and the detection unit (130) collects a current of an output signal of the detection power source (110).
6. The impedance detection circuit according to claim 5, wherein the first detection resistor (R1) and the second detection resistor (R2) are connected to the detection power supply (110) through the detection unit (130).
7. The impedance detection circuit according to claim 1, wherein the first switch element (T1) and the second switch element (T2) are both NMOS transistors.
8. A liquid crystal display device comprising a printed circuit board (300) and a flexible wiring board (400) connected to the printed circuit board (300), wherein the liquid crystal display device comprises the impedance detecting circuit according to any one of claims 1 to 7, and two bonding impedances formed at two bonding points of the flexible wiring board (400) and the printed circuit board (300) are defined as the first detecting resistor (R1) and the second detecting resistor (R2).
9. The lcd apparatus of claim 8, wherein a connector (310) is provided on the printed circuit board (300), a first control terminal of the first switching element (T1) is connected to the processing unit (120) through the connector (310), a second control terminal of the second switching element (T2) is connected to the processing unit (120) through the connector (310), and a second path terminal of the first switching element (T1) is connected to the sensing power supply (110) through the connector (310).
10. The lcd apparatus of claim 8, wherein the impedance detection circuit communicates with an external device (200) through an external interface.
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| CN106128342A (en) * | 2016-06-24 | 2016-11-16 | 京东方科技集团股份有限公司 | The detection method of array base palte, display device and array base palte |
| CN106908971A (en) * | 2017-04-28 | 2017-06-30 | 南京中电熊猫平板显示科技有限公司 | The binding blocking apparatus and its binding hold-up interception method of liquid crystal display panel |
| CN107591117A (en) * | 2017-09-26 | 2018-01-16 | 武汉华星光电技术有限公司 | The method of testing and test system of display panel |
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