CN111243475B - Power supply system of display panel test fixture - Google Patents
Power supply system of display panel test fixture Download PDFInfo
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- CN111243475B CN111243475B CN202010244166.3A CN202010244166A CN111243475B CN 111243475 B CN111243475 B CN 111243475B CN 202010244166 A CN202010244166 A CN 202010244166A CN 111243475 B CN111243475 B CN 111243475B
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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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
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- Testing Electric Properties And Detecting Electric Faults (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a power supply system of a display panel test fixture, which can provide power supply signals for a display panel, and comprises: the controller comprises an input voltage detection end, a common voltage detection end and a control signal output end; the first end and the second end of the connector are respectively and electrically connected with the input voltage detection end and the common voltage detection end, and the fourth end of the connector is grounded; the connector is used for connecting the display panel; the input end of the MOSFET controller is electrically connected with the control signal output end of the controller, and the output end of the MOSFET controller is electrically connected with the control end of the buck converter; and the output end of the buck converter is electrically connected with the third end of the connector. The power supply system of the display panel test fixture of the embodiment of the invention can output accurate voltage signals to the display panel.
Description
Technical Field
The embodiment of the invention relates to a display technology, in particular to a power supply system of a display panel test fixture.
Background
With the development of display technology, the application of display panels is becoming more and more extensive, and the requirements for display panels are becoming higher and higher accordingly.
The existing display panel needs to be tested by using a display panel test fixture firstly, the existing display panel test fixture generally needs a wire to be electrically connected with the display panel, the display panel is lightened by using the display panel test fixture, a certain voltage drop exists on the wire, the voltage output to the display panel by a display panel test fixture power supply system is not accurate enough, the actual voltage input by the display panel cannot be identified by the display panel test fixture, when the display panel is tested, the voltage output by the display panel test fixture is adopted, however, a larger error exists between the output voltage of the display panel test fixture and the voltage of the actual work of the display panel, and the accuracy of the test cannot be ensured.
Disclosure of Invention
The invention provides a power supply system of a display panel test fixture, which is used for outputting accurate voltage signals to a display panel.
The embodiment of the invention provides a power supply system of a display panel test fixture, which can provide power supply signals for a display panel, and the power supply system comprises: the controller comprises an input voltage detection end, a common voltage detection end and a control signal output end; the first end and the second end of the connector are respectively and electrically connected with the input voltage detection end and the common voltage detection end; the connector is used for connecting the display panel; the input end of the MOSFET controller is electrically connected with the control signal output end of the controller, and the output end of the MOSFET controller is electrically connected with the control end of the buck converter; the output end of the buck converter is electrically connected with the third end of the connector, and the fourth end of the connector is grounded.
Optionally, the buck converter comprises: the circuit comprises a first MOS tube, a second MOS tube, a first inductor, a first capacitor and a second capacitor; the control end of the first MOS tube is electrically connected with the first control signal output end of the MOSFET controller, the first end of the first MOS tube is connected with a voltage signal, and the second end of the first MOS tube is electrically connected with the first end of the first inductor; the control end of the second MOS tube is electrically connected with a second control signal output end of the MOSFET controller, the first end of the second MOS tube is electrically connected with the first end of the first inductor, and the second end of the second MOS tube is grounded; the first end of the first capacitor is electrically connected with the second end of the first inductor, and the second end of the first capacitor is grounded; the first end of the second capacitor is electrically connected with the second end of the first inductor, and the second end of the second capacitor is grounded; and the second end of the first inductor is used as the output end of the buck converter.
Optionally, the method further comprises: and the input end of the voltage division circuit is electrically connected with the first end of the connector, and the output end of the voltage division circuit is electrically connected with the input voltage detection end of the controller.
Optionally, the voltage divider circuit comprises a first resistor and a second resistor; a first end of the first resistor is used as an input end of the voltage division circuit, a second end of the first resistor is electrically connected with a first end of the second resistor, and a second end of the first resistor is used as an output end of the voltage division circuit; and the second end of the second resistor is grounded.
Optionally, the method further comprises: the input end of the voltage division circuit is electrically connected with the first end of the connector through the first operational amplifier, wherein the non-inverting input end of the first operational amplifier is electrically connected with the first end of the connector, the inverting input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is electrically connected with the input end of the voltage division circuit; and/or the output end of the voltage division circuit is electrically connected with the input voltage detection end of the controller through the second operational amplifier, wherein the non-inverting input end of the second operational amplifier is electrically connected with the output end of the voltage division circuit, the inverting input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is electrically connected with the input voltage detection end of the controller.
Optionally, the method further comprises: the non-inverting input end of the first operational amplifier is electrically connected with the first end of the connector through the filter circuit, and the filter circuit comprises a third resistor and a third capacitor; a first end of the third resistor is electrically connected with a first end of the connector, a second end of the third resistor is electrically connected with a first end of the third capacitor, and a second end of the third resistor is electrically connected with a non-inverting input end of the first operational amplifier; and the second end of the third capacitor is grounded.
Optionally, the method further comprises: and a first end of the fourth resistor is electrically connected with a first end of the third resistor, and a second end of the fourth resistor is electrically connected with an output end of the buck converter.
Optionally, the method further comprises: and the public voltage detection end of the controller is electrically connected with the second end of the connector through the third operational amplifier, wherein the non-inverting input end of the third operational amplifier is electrically connected with the second end of the connector, the output end of the third operational amplifier is electrically connected with the inverting input end of the third operational amplifier, and the output end of the third operational amplifier is electrically connected with the public voltage detection end of the controller.
Optionally, the method further comprises: and a first end of the fifth resistor is electrically connected with the non-inverting input end of the third operational amplifier, and a second end of the fifth resistor is grounded.
Optionally, the method further comprises: the non-inverting input end of the third operational amplifier is electrically connected with the second end of the connector through the sixth resistor, the first end of the sixth resistor is electrically connected with the second end of the connector, and the second end of the sixth resistor is electrically connected with the non-inverting input end of the third operational amplifier; and the first end of the fourth capacitor is electrically connected with the second end of the sixth resistor, and the second end of the fourth capacitor is grounded.
The power supply system of the display panel test fixture comprises a controller, wherein the controller comprises an input voltage detection end, a common voltage detection end and a control signal output end; the first end and the second end of the connector are respectively and electrically connected with the input voltage detection end and the public voltage detection end, and the fourth end of the connector is grounded; the connector is used for connecting the display panel; the input end of the MOSFET controller is electrically connected with the control signal output end of the controller, and the output end of the MOSFET controller is electrically connected with the control end of the buck converter; the output end of the buck converter is electrically connected with the third end of the connector. The controller can detect the actual input voltage and the actual public voltage of display panel, and then calculates display panel actual operating voltage, and then adjusts the output voltage of connector third end through MOSFET controller and step-down converter for display panel's input voltage is more accurate, also is more close the voltage of actual work time, still can make test fixture's test result more accurate simultaneously.
Drawings
Fig. 1 is a schematic circuit diagram of a test fixture for a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure of an embodiment of a display panel testing fixture and a display panel;
fig. 3 is a schematic circuit diagram of a display panel testing fixture according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a test fixture for a display panel according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a test fixture for a display panel according to another embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a testing fixture for a display panel according to another embodiment of the present invention;
fig. 7 is a schematic circuit structure diagram of another display panel testing fixture according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic circuit structure diagram of a display panel test fixture according to an embodiment of the present invention, and referring to fig. 1, a display panel test fixture 10 includes a display panel test fixture power supply system capable of providing a power supply signal to a display panel, and the display panel test fixture power supply system includes: the controller 101, the controller 101 includes an input voltage detecting terminal A1, a common voltage detecting terminal A2 and a control signal output terminal A3; the connector 102, the connector 102 includes a first end B1, a second end B2, a third end B3 and a fourth end B4, the first end B1 and the second end B2 of the connector 102 are respectively electrically connected with the input voltage detection end A1 and the common voltage detection end A2, and the fourth end B4 of the connector 102 is grounded; the connector 102 is used for connecting a display panel; the input end C1 of the MOSFET controller 103 is electrically connected with the control signal output end A3 of the controller 101, the output end C2 of the MOSFET controller 103 is electrically connected with the control end D1 of the buck converter 104, and the output end D2 of the buck converter 104 is electrically connected with the third end B3 of the connector 102.
Specifically, fig. 2 is a schematic diagram of a circuit structure of an embodiment of a display panel test fixture and a display panel, and with reference to fig. 1 and fig. 2, a display panel 11 may include an input signal terminal VIN, a common voltage terminal GND, an input signal feedback terminal VIN _ FB and a common voltage feedback terminal GND _ FB, where the test fixture 10 provides a power signal, such as an input voltage and an input current, to the input signal terminal VIN of the display panel through a third terminal B3 of a connector 102, and is connected back to the display panel test fixture through the common voltage terminal GND of the display panel 11 and a fourth terminal B4 of the connector 102 to turn on the display panel, so as to test the display panel 11; the input voltage may be a voltage VCI for lighting the display panel; when the display panel 11 is a liquid crystal display panel, the input voltage may also be a voltage VBL for lighting the backlight; the input signal feedback terminal VIN _ FB of the display panel 11 feeds back the input voltage of the display panel, and the common voltage feedback terminal GND _ FB of the display panel 11 feeds back the common voltage of the display panel, where the common voltage may be a ground voltage; the input signal feedback terminal VIN _ FB and the common voltage feedback terminal GND _ FB of the display panel 11 only output voltage signals, but do not output or output extremely small current signals, therefore, the signal received by the input voltage detection terminal A1 of the controller 101 is the input voltage of the display panel, the signal received by the common voltage detection terminal A2 of the controller 101 is the common voltage of the display panel, the difference between the signal received by the input voltage detection terminal A1 of the controller 101 and the signal received by the common voltage detection terminal A2 of the controller 101 is the actual working voltage of the display panel 11, and the controller 101 can output a control signal according to the actual working voltage of the display panel 11, control the working state of the MOSFET controller 103, and further control the output signal of the buck converter 104, so that the voltage finally received by the display panel 11 is the voltage required by the actual working of the display panel 11. For example, if the input signal terminal VIN of the display panel 11 needs to input a voltage of 5V, if the output terminal of the buck converter 104 directly outputs a voltage of 5V, the ground voltage of the display panel test fixture 10 is 0V, when a current flows through the loop, a voltage drop, for example, 0.2V, may exist in the wire between the input signal terminal VIN of the display panel 11 and the third terminal B3 of the connector 102, and a voltage drop, for example, 0.2V, also exists in the wire between the common voltage terminal GND of the display panel 11 and the fourth terminal B4 of the connector 102, so that the voltage between the input signal terminal VIN of the display panel 11 and the common voltage terminal GND of the display panel 11 is only 4.6V, and when the display panel 11 operates at 4.6V, the test result (for example, the power consumption of the display panel) of the test fixture 10 may have a large error with the actual result (for example, the actual power consumption) of the display panel 11 in the normal operating state; after the controller 101 measures the actual working voltage of the display panel 11, it controls the control signal output end A3 to output a control signal, and further controls the working state of the MOSFET controller 103, and finally controls the output voltage of the buck converter 104, for example, increases the output voltage of the buck converter 104, until the difference between the voltage value of the input signal detecting end A1 of the controller 101 and the voltage value of the input signal of the common voltage detecting end A2 of the controller 101 is 5V, which indicates that the display panel works in the state of 5V at this time, thereby ensuring that the working state of the display panel during testing is consistent with the working state during actual working, and further improving the accuracy of the testing result of the testing fixture.
According to the technical scheme of the embodiment, the power supply system of the display panel test fixture comprises a controller, wherein the controller comprises an input voltage detection end, a common voltage detection end and a control signal output end; the first end and the second end of the connector are respectively and electrically connected with the input voltage detection end and the common voltage detection end, and the fourth end of the connector is grounded; the connector is used for connecting the display panel; the input end of the MOSFET controller is electrically connected with the control signal output end of the controller, and the output end of the MOSFET controller is electrically connected with the control end of the buck converter; the output end of the buck converter is electrically connected with the third end of the connector. The controller can detect the actual input voltage and the actual public voltage of display panel, and then calculates display panel actual operating voltage, and then adjusts the output voltage of connector third end through MOSFET controller and step-down converter for display panel's input voltage is more accurate, also is more close the voltage of actual work time, still can make test fixture's test result more accurate simultaneously.
It should be noted that, the controller 101 in the power supply system of the display panel testing jig according to the embodiment of the invention can calculate the power consumption of the display panel 11 by using the voltages input by the input voltage detecting terminal A1 and the common voltage detecting terminal A2, and since the voltage input by the input voltage detecting terminal A1 is the actual input voltage of the display panel, and the voltage input by the common voltage detecting terminal A2 is the actual common voltage of the display panel, the power consumption calculation is more accurate.
Optionally, fig. 3 is a schematic circuit structure diagram of another display panel test fixture according to an embodiment of the present invention, and referring to fig. 3, the buck converter 104 includes: a first MOS transistor 1041, a second MOS transistor 1042, a first inductor 1043, a first capacitor 1044, and a second capacitor 1045; a control end of the first MOS transistor 1041 is electrically connected to a first control signal output end HO of the MOSFET controller 103, a first end of the first MOS transistor 1041 is connected to a voltage signal V1, and a second end of the first MOS transistor 1041 is electrically connected to a first end of the first inductor 1043; a control end of the second MOS transistor 1042 is electrically connected to the second control signal output end LO of the MOSFET controller 103, a first end of the second MOS transistor 1042 is electrically connected to the first end of the first inductor 1043, and a second end of the second MOS transistor 1042 is grounded; a first end of the first capacitor 1044 is electrically connected to the second end of the first inductor 1043, and a second end of the first capacitor 1044 is grounded; a first end of the second capacitor 1045 is electrically connected to a second end of the first inductor 1043, and a second end of the second capacitor 1045 is grounded; the second terminal of the first inductor 1043 serves as an output terminal of the buck converter.
Specifically, as shown in fig. 3, the control signal output terminal A3 of the controller 101 may include a first PWM signal output terminal PWM1 and a second PWM signal output terminal PWM2, wherein the first PWM signal output terminal PWM1 and the second PWM signal output terminal PWM2 respectively output PWM (Pulse width modulation) signals with opposite polarities, the model of the MOSFET controller 103 may be UCC27210 or UC277211, which may include a plurality of pins (VDD, LI, HI, VSS, HB, HO, HS, and LO), wherein functions and circuit connection manners of the pins are well known to those skilled in the art and are not described herein; the second power supply V2 supplies power to the MOSFET controller 103, and the MOSFET controller 103 adjusts the two output PWM signals according to the received first PWM signal and the second PWM signal to respectively control the on/off of the first MOS transistor 1041 and the second MOS transistor 1042; the controller 101 may adjust duty ratios of the first PWM signal and the second PWM signal according to signals detected by the input voltage detection terminal A1 and the common voltage detection terminal A2, further adjust conduction times of the first MOS transistor 1041 and the second MOS transistor 1042 through the MOSFET controller 103, that is, control a time length for the first inductor 1043 to receive the voltage signal V1, and finally adjust a voltage of the third terminal B3 of the connector, that is, adjust an input voltage of the display panel, through a combined action of the first inductor 1043, the first capacitor 1044, and the second capacitor 1045.
Through the concrete circuit structure who sets up MOSFET controller and buck converter in this embodiment, components and parts costs such as MOSFET controller, MOS pipe, electric capacity and inductance all are cheap, are favorable to reducing display panel test fixture's overall cost, can also accurately export the required input voltage of work to display panel simultaneously.
Optionally, fig. 4 is a schematic circuit structure diagram of another display panel testing jig according to an embodiment of the present invention, and referring to fig. 4, the power supply system of the display panel testing jig further includes a voltage divider 201, an input end of the voltage divider 201 is electrically connected to the first end B1 of the connector, and an output end of the voltage divider 201 is electrically connected to the input voltage detecting end A1 of the controller.
Specifically, the input voltage of the display panel is higher than the voltage that the controller 101 is allowed to receive during normal operation, and if the range of the voltage received by the input voltage detection terminal of the controller 101 needs not to exceed 3V, the voltage input by the first terminal B1 of the connector is divided by the voltage division function of the voltage division circuit 201, and then the divided voltage does not exceed 3V and is transmitted to the input voltage detection terminal A1 of the controller 101, so that the controller 101 can be ensured to operate normally.
Optionally, the voltage divider circuit 201 includes a first resistor 2011 and a second resistor 2012; a first end of the first resistor 2011 serves as an input end of the voltage divider 201, a second end of the first resistor 2011 is electrically connected with a first end of the second resistor 2012, and a second end of the first resistor 2011 serves as an output end of the voltage divider 201; the second terminal of the second resistor 2012 is connected to ground.
Specifically, the voltage division is realized by the serial voltage division effect of the first resistor 2011 and the second resistor 2012, the circuit structure is simple, and the input signal and the output signal of the voltage division circuit are easy to calculate, which is beneficial to reducing the circuit cost and the operation time.
Optionally, fig. 5 is a schematic circuit structure diagram of another display panel testing fixture according to an embodiment of the present invention, and referring to fig. 5, the power supply system of the display panel testing fixture further includes: the input end of the voltage dividing circuit 201 is electrically connected with the first end B1 of the connector through the first operational amplifier 202, wherein the non-inverting input end of the first operational amplifier 202 is electrically connected with the first end B1 of the connector, the inverting input end of the first operational amplifier 202 is electrically connected with the output end of the first operational amplifier 202, and the output end of the first operational amplifier 202 is electrically connected with the input end of the voltage dividing circuit 201; and/or, the output terminal of the voltage divider 201 is electrically connected to the input voltage detection terminal A1 of the controller 101 through the second operational amplifier 203, wherein the non-inverting input terminal of the second operational amplifier 203 is electrically connected to the output terminal of the voltage divider 201, the inverting input terminal of the second operational amplifier 203 is electrically connected to the output terminal of the second operational amplifier 203, and the output terminal of the second operational amplifier 203 is electrically connected to the input voltage detection terminal A1 of the controller 101.
Specifically, the first operational amplifier 202 may be configured as a voltage follower connection, and is configured to buffer a voltage signal received at the first end B1 of the connector and transmit the buffered voltage signal to the input end of the voltage divider circuit 201, so as to reduce signal loss. The second operational amplifier 203 may be configured as a voltage follower connection, and is used to buffer the voltage signal output from the output terminal of the voltage dividing circuit 201 and transmit the buffered voltage signal to the input voltage detecting terminal A1 of the controller 101, so as to reduce signal loss.
Optionally, fig. 6 is a schematic circuit structure diagram of another display panel testing fixture according to an embodiment of the present invention, and referring to fig. 6, the power supply system of the display panel testing fixture further includes: a filter circuit 204, wherein a non-inverting input terminal of the first operational amplifier 202 is electrically connected to the first terminal B1 of the connector through the filter circuit 204, and the filter circuit 204 includes a third resistor 2041 and a third capacitor 2042; a first end of the third resistor 2041 is electrically connected to the first end B1 of the connector, a second end of the third resistor 2041 is electrically connected to a first end of the third capacitor 2042, and a second end of the third resistor 2041 is electrically connected to the non-inverting input terminal of the first operational amplifier 202; a second terminal of the third capacitor 2042 is grounded.
Specifically, the third resistor 2041 and the third capacitor 2042 form a resistance-capacitance filter network for filtering a voltage signal input from the first end B1 of the connector, so as to improve the anti-interference capability of the display panel test fixture.
Optionally, with continued reference to fig. 6, the power supply system for a display panel testing fixture further includes: a fourth resistor 205, wherein a first end of the fourth resistor 205 is electrically connected to a first end of the third resistor 2041, and a second end of the fourth resistor 205 is electrically connected to the output end of the buck converter 104.
Specifically, when the display panel testing jig is not connected to the display panel, if the non-inverting input terminal of the first operational amplifier 202 does not receive any signal, that is, is in an idle state, the performance is unstable at this time, the signal of the input voltage detecting terminal A1 of the controller 101 is uncertain, and the controller 101 is prone to be out of order, and through the action of the fourth resistor 205, the voltage output by the output terminal of the buck converter 104 is filtered by the fourth resistor 205 and the filter circuit 204 and then transmitted to the non-inverting input terminal of the first operational amplifier 202, and further output to the input signal detecting terminal A1 of the controller 101, so that when the display panel testing jig is not connected to the display panel, the function of the controller 101 is guaranteed to be out of order.
Optionally, with continued reference to fig. 6, the power supply system for a display panel testing fixture further includes: the common voltage detecting terminal A2 of the controller 101 is electrically connected to the second terminal B2 of the connector through the third operational amplifier 301, wherein the non-inverting input terminal of the third operational amplifier 301 is electrically connected to the second terminal B2 of the connector, the output terminal of the third operational amplifier 301 is electrically connected to the inverting input terminal of the third operational amplifier 301, and the output terminal of the third operational amplifier 301 is electrically connected to the common voltage detecting terminal A2 of the controller 101.
Specifically, the third operational amplifier 301 may be configured as a voltage follower connection for buffering the voltage signal received by the second terminal B2 of the connector and then transmitting the buffered voltage signal to the common voltage detection terminal A2 of the controller 101, so as to reduce signal loss.
Optionally, fig. 7 is a schematic circuit structure diagram of another display panel testing jig according to an embodiment of the present invention, and referring to fig. 7, the power supply system of the display panel testing jig further includes: a fifth resistor 304, wherein a first terminal of the fifth resistor 304 is electrically connected to the non-inverting input terminal of the third operational amplifier 301, and a second terminal of the fifth resistor 304 is grounded.
Specifically, the power supply system for a display panel testing fixture may further include a sixth resistor 303 and a fourth capacitor 302, the non-inverting input terminal of the third operational amplifier 301 is electrically connected to the second end B2 of the connector through the sixth resistor 303, the first end of the sixth resistor 303 is electrically connected to the second end B2 of the connector, and the second end of the sixth resistor 303 is electrically connected to the non-inverting input terminal of the third operational amplifier 301; a first terminal of the fourth capacitor 302 is electrically connected to a second terminal of the sixth resistor 303, and a second terminal of the fourth capacitor 302 is grounded. The sixth resistor 303 and the fourth capacitor 302 form a resistance-capacitance filter network, and are used for filtering a voltage signal input from the second end B2 of the connector, so that the anti-interference capability of the display panel test fixture is improved. Meanwhile, when the display panel test fixture is not connected to the display panel, if the non-inverting input terminal of the third operational amplifier 301 does not receive any signal, that is, is in an idle state, the signal of the common voltage detection terminal A2 of the controller is uncertain, and the performance is unstable at this time, which makes the controller 101 function disorder easily, the non-inverting input terminal of the third operational amplifier is grounded through the fifth resistor 304 by the action of the fifth resistor 304, so that it is ensured that the common voltage detection terminal A2 of the controller 101 also has a signal input when the display panel test fixture is not connected to the display panel, thereby ensuring that the function of the controller 101 is not disorder.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (9)
1. The utility model provides a display panel test fixture electrical power generating system, it can provide power signal to display panel, its characterized in that, electrical power generating system includes:
the controller comprises an input voltage detection end, a common voltage detection end and a control signal output end;
the first end and the second end of the connector are respectively and electrically connected with the input voltage detection end and the common voltage detection end; the connector is used for connecting the display panel, and the fourth end of the connector is grounded;
the input end of the MOSFET controller is electrically connected with the control signal output end of the controller, and the output end of the MOSFET controller is electrically connected with the control end of the buck converter; the output end of the buck converter is electrically connected with the third end of the connector;
the buck converter includes:
the circuit comprises a first MOS tube, a second MOS tube, a first inductor, a first capacitor and a second capacitor;
the control end of the first MOS tube is electrically connected with a first control signal output end of the MOSFET controller, a first end of the first MOS tube is connected with a voltage signal, and a second end of the first MOS tube is electrically connected with a first end of the first inductor;
the control end of the second MOS tube is electrically connected with a second control signal output end of the MOSFET controller, the first end of the second MOS tube is electrically connected with the first end of the first inductor, and the second end of the second MOS tube is grounded;
the first end of the first capacitor is electrically connected with the second end of the first inductor, and the second end of the first capacitor is grounded;
the first end of the second capacitor is electrically connected with the second end of the first inductor, and the second end of the second capacitor is grounded;
and the second end of the first inductor is used as the output end of the buck converter.
2. The power supply system according to claim 1, further comprising: and the input end of the voltage division circuit is electrically connected with the first end of the connector, and the output end of the voltage division circuit is electrically connected with the input voltage detection end of the controller.
3. The power supply system according to claim 2,
the voltage division circuit comprises a first resistor and a second resistor;
a first end of the first resistor is used as an input end of the voltage division circuit, a second end of the first resistor is electrically connected with a first end of the second resistor, and a second end of the first resistor is used as an output end of the voltage division circuit;
and the second end of the second resistor is grounded.
4. The power supply system according to claim 2, further comprising:
the input end of the voltage division circuit is electrically connected with the first end of the connector through the first operational amplifier, wherein the non-inverting input end of the first operational amplifier is electrically connected with the first end of the connector, the inverting input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is electrically connected with the input end of the voltage division circuit; and/or the presence of a gas in the atmosphere,
the output end of the voltage division circuit is electrically connected with the input voltage detection end of the controller through the second operational amplifier, wherein the non-inverting input end of the second operational amplifier is electrically connected with the output end of the voltage division circuit, the inverting input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is electrically connected with the input voltage detection end of the controller.
5. The power supply system according to claim 4, further comprising:
the non-inverting input end of the first operational amplifier is electrically connected with the first end of the connector through the filter circuit, and the filter circuit comprises a third resistor and a third capacitor;
a first end of the third resistor is electrically connected with a first end of the connector, a second end of the third resistor is electrically connected with a first end of the third capacitor, and a second end of the third resistor is electrically connected with a non-inverting input end of the first operational amplifier;
and the second end of the third capacitor is grounded.
6. The power supply system of claim 5, further comprising:
and a first end of the fourth resistor is electrically connected with a first end of the third resistor, and a second end of the fourth resistor is electrically connected with an output end of the buck converter.
7. The power supply system of claim 1, further comprising: and the common voltage detection end of the controller is electrically connected with the second end of the connector through the third operational amplifier, wherein the non-inverting input end of the third operational amplifier is electrically connected with the second end of the connector, the output end of the third operational amplifier is electrically connected with the inverting input end of the third operational amplifier, and the output end of the third operational amplifier is electrically connected with the common voltage detection end of the controller.
8. The power supply system of claim 7, further comprising:
and a first end of the fifth resistor is electrically connected with the non-inverting input end of the third operational amplifier, and a second end of the fifth resistor is grounded.
9. The power supply system according to claim 7, further comprising:
the non-inverting input end of the third operational amplifier is electrically connected with the second end of the connector through the sixth resistor, the first end of the sixth resistor is electrically connected with the second end of the connector, and the second end of the sixth resistor is electrically connected with the non-inverting input end of the third operational amplifier;
and the first end of the fourth capacitor is electrically connected with the second end of the sixth resistor, and the second end of the fourth capacitor is grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010244166.3A CN111243475B (en) | 2020-03-31 | 2020-03-31 | Power supply system of display panel test fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010244166.3A CN111243475B (en) | 2020-03-31 | 2020-03-31 | Power supply system of display panel test fixture |
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| CN111243475A CN111243475A (en) | 2020-06-05 |
| CN111243475B true CN111243475B (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103943086A (en) * | 2014-04-02 | 2014-07-23 | 合肥鑫晟光电科技有限公司 | Analog voltage source circuit and display device |
| CN105261345A (en) * | 2015-11-30 | 2016-01-20 | 深圳市华星光电技术有限公司 | T-CON load variation voltage control circuit, display panel and display device |
| CN109036301A (en) * | 2018-07-06 | 2018-12-18 | 武汉精测电子集团股份有限公司 | A kind of distal end voltage compensating method compensated automatically based on hardware circuit |
| CN109637404A (en) * | 2018-11-21 | 2019-04-16 | 惠科股份有限公司 | drive circuit and display panel |
-
2020
- 2020-03-31 CN CN202010244166.3A patent/CN111243475B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103943086A (en) * | 2014-04-02 | 2014-07-23 | 合肥鑫晟光电科技有限公司 | Analog voltage source circuit and display device |
| CN105261345A (en) * | 2015-11-30 | 2016-01-20 | 深圳市华星光电技术有限公司 | T-CON load variation voltage control circuit, display panel and display device |
| CN109036301A (en) * | 2018-07-06 | 2018-12-18 | 武汉精测电子集团股份有限公司 | A kind of distal end voltage compensating method compensated automatically based on hardware circuit |
| CN109637404A (en) * | 2018-11-21 | 2019-04-16 | 惠科股份有限公司 | drive circuit and display panel |
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| CN111243475A (en) | 2020-06-05 |
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