CN220584895U - Local dimming test fixture for backlight module - Google Patents
Local dimming test fixture for backlight module Download PDFInfo
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- CN220584895U CN220584895U CN202322343560.4U CN202322343560U CN220584895U CN 220584895 U CN220584895 U CN 220584895U CN 202322343560 U CN202322343560 U CN 202322343560U CN 220584895 U CN220584895 U CN 220584895U
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- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000005070 sampling Methods 0.000 claims description 14
- 230000009977 dual effect Effects 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Abstract
The utility model provides a local dimming test fixture for a backlight module, which comprises a signal processing module, a current detection module and a display screen, wherein the signal processing module comprises a micro processor and a DC-DC converter which are electrically connected, the DC-DC converter is connected with a cathode of the backlight module through a first circuit, the DC-DC converter is connected with an anode of the backlight module through a second circuit, the current detection module is connected on the second circuit, the current detection module is electrically connected with the micro processor through a third circuit, the third circuit is used for outputting current detected by the current detection module, the backlight module and the display screen are respectively electrically connected with the micro processor, and the display screen is used for displaying the detected current. The local dimming test fixture for the backlight module can monitor and display the current change in real time, and has the advantages of low cost and wide application range.
Description
Technical Field
The present utility model relates to a testing jig, and more particularly to a local dimming testing jig for a backlight module.
Background
Local Dimming is a technique for controlling backlight in a liquid crystal display, and improves display effect and saves energy by adjusting brightness and area of a backlight module. When the Local Dimming test is performed, the current of the lamp panel of the backlight module needs to be detected to ensure the correct output of software (a driver for lighting the backlight module) and the normal operation of the power module.
As shown in fig. 1, the conventional test fixture includes a signal processing unit 31 and an information display screen 32 electrically connected to the signal processing unit 31, wherein the signal processing unit 31 includes an MCU311 (micro signal processor) circuit and a DC-DC circuit 312, the DC-DC circuit 312 is connected to an anode of the backlight module 33, the MCU311 circuit is connected to a cathode of the backlight module 33, and the information display screen 32 is used for displaying a test result of the backlight module 33, and because the conventional test fixture has no current detection function, it cannot be determined whether the software outputs a suitable current according to the design requirement.
Disclosure of Invention
Therefore, the present utility model is directed to a local dimming test fixture for a backlight module, which can monitor and display the current change in real time, and has low cost and wide application range.
The utility model provides a local dimming test fixture for a backlight module, which comprises a signal processing module, a current detection module and a display screen, wherein the signal processing module comprises a micro processor and a DC-DC converter which are electrically connected, the DC-DC converter is connected with a cathode of the backlight module through a first circuit, the DC-DC converter is connected with an anode of the backlight module through a second circuit, the current detection module is connected on the second circuit, the current detection module is electrically connected with the micro processor through a third circuit, the third circuit is used for outputting current detected by the current detection module, the backlight module and the display screen are respectively electrically connected with the micro processor, and the display screen is used for displaying the detected current.
In an embodiment, the current detection module includes a sampling resistor and a dual operational amplifier, the sampling resistor is connected to the second circuit, the current detection module further includes a fourth circuit, the fourth circuit is connected to two ends of the sampling resistor along a current direction, the dual operational amplifier is connected to the fourth circuit, and the third circuit is used for connecting the dual operational amplifier and the microprocessor.
In one embodiment, the first circuit is provided with an LED driver.
In an embodiment, the backlight module includes a plurality of light emitting units, and the LED driver is electrically connected to each of the light emitting units.
In an embodiment, the DC-DC converter includes a fifth circuit, a sixth circuit, a seventh circuit, a diode, an inductor and a capacitor, where the sixth circuit and the seventh circuit are respectively connected in parallel with the fifth circuit, an input end of the fifth circuit is connected with a DC power supply, an output end of the fifth circuit is electrically connected with an anode of the backlight module, the inductor is connected to the fifth circuit, the inductor is located between the sixth circuit and the seventh circuit, the diode is connected to the sixth circuit, and the capacitor is connected to the seventh circuit.
In an embodiment, the local dimming test fixture for a backlight module further includes a circuit board, and the signal processing module and the current detecting module are respectively disposed on the circuit board.
In one embodiment, the microprocessor is provided with an ADC function pin, and the ADC function pin is configured to convert an analog signal collected by the current detection module into a data signal for display.
In an embodiment, the data transmission is performed between the microprocessor and the backlight module through an SPI.
In an embodiment, the local dimming test fixture for the backlight module further includes a prompting lamp, the prompting lamp is electrically connected with the micro-processor, when the current or the voltage collected by the micro-processor is an abnormal value, the prompting lamp is displayed in red, and when the current or the voltage collected by the micro-processor is a normal value, the prompting lamp is displayed in green.
In an embodiment, the local dimming test fixture for the backlight module further includes an alarm, the alarm is electrically connected with the microprocessor, and when the current or the voltage collected by the microprocessor is an abnormal value, the alarm sends out an alarm prompt.
The local dimming test fixture for the backlight module can monitor the change of the current in real time, find out abnormal conditions in the circuit in time, such as overload, short circuit or unmatched current and design parameters, and the like, and the change of the current can be directly read through a display screen, so that the local dimming test fixture is low in cost and wide in application range.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a conventional test fixture;
FIG. 2 is a schematic circuit diagram of a signal processing module, a current detecting module and a backlight module according to the present utility model;
FIG. 3 is a schematic circuit diagram of a local dimming tester for a backlight module according to the present utility model;
FIG. 4 is a schematic diagram of a current detecting circuit according to the present utility model;
fig. 5 is a circuit schematic of the DC-DC converter of the present utility model;
reference numerals: a signal processing module-11; a microprocessor-111; a DC-DC converter-112; a fifth circuit-1121; a sixth circuit-1122; seventh circuit-1123; a diode-1124; inductance-1125; capacitance-1126; a current detection module-12; sampling resistor-121; a dual operational amplifier-122; a fourth circuit-124; a display screen-13; a first circuit-14; a second circuit-15; a third circuit-16; and a backlight module 20.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.
The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the inventive product is conventionally disposed in use, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the utility model.
The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.
As shown in fig. 2 to 5, the local dimming test fixture for the backlight module comprises a signal processing module 11, a current detecting module 12 and a display screen 13, wherein the signal processing module 11 comprises a microprocessor 111 and a DC-DC converter 112 which are electrically connected, the DC-DC converter 112 is connected with the cathode of the backlight module 20 through a first circuit 14, the DC-DC converter 112 is connected with the anode of the backlight module 20 through a second circuit 15, the current detecting module 12 is connected on the second circuit 15, the current detecting module 12 is electrically connected with the microprocessor 111 through a third circuit 16, the third circuit 16 is used for outputting the load current detected by the current detecting module 12, the backlight module 20 and the display screen 13 are respectively electrically connected with the microprocessor 111, and the display screen 13 is used for displaying the detected current. The DC-DC converter 112 is a device that converts electric energy of one voltage value into electric energy of another voltage value in a direct current circuit.
The local dimming test fixture for the backlight module can monitor the current change in real time, find out abnormal conditions in a circuit in time, such as overload, short circuit or unmatched current and design parameters, and the like, and the current change can be directly read through the display screen 13, so that the local dimming test fixture is low in cost and wide in application range.
Further, the current detection module 12 includes a sampling resistor (R1) 121 and a dual operational amplifier 122, the sampling resistor (R1) 121 is connected to the second circuit 15, the current detection module 12 further includes a fourth circuit 124, the fourth circuit 124 is connected to two ends of the sampling resistor (R1) 121 along the current direction, the dual operational amplifier 122 is connected to the fourth circuit 124, and the third circuit 16 is used for connecting the dual operational amplifier 122 and the microprocessor 111. In this embodiment, the sampling resistor (R1) 121 is used for sampling current, and a resistor with a smaller resistance value is connected in series, and the commonly used resistance value is 10mΩ or 50mΩ; the dual operational amplifier 122 integrates two general operational amplifiers on a single chip, and has the characteristics of high gain, high common mode rejection ratio, wide common mode range, simple compensation, stable operation, good temperature stability between the two operational amplifiers and the like; the voltage of two sections of the sampling resistor (R1) 121 is collected, a current value is obtained according to ohm's law, and the obtained current value is displayed through the display screen 13.
Further, the first circuit 14 is provided with an LED Driver (LED Driver), which is a power supply adjusting electronic device for driving the LED to emit light or the LED module to work normally, the backlight module 20 further includes a plurality of light emitting units, the LED Driver is electrically connected with the cathodes of the light emitting units, wherein one LED Driver can be electrically connected with 1 to 48 light emitting units, preferably one LED Driver is electrically connected with 48 light emitting units of the backlight module 20, so that the LED Driver is provided with 4 light emitting units, which are LED light beads.
Further, the DC-DC converter 112 adopts a buck topology circuit, and the current output by the DC-DC converter 112 flows on the second circuit 15 and is output to the anode of the light emitting unit of the backlight module 20 after passing through the sampling resistor (R1) 121; the DC-DC converter 112 includes a fifth circuit 1121, a sixth circuit 1122, a seventh circuit 1123, a diode 1124, an inductor 1125 and a capacitor 1126, the sixth circuit 1122 and the seventh circuit 1123 are respectively connected in parallel with the fifth circuit 1121, an input terminal of the fifth circuit 1121 is connected to a DC power supply, an output terminal of the fifth circuit 1121 is electrically connected to an anode of the backlight module 20, the inductor 1125 is connected to the fifth circuit 1121, the inductor 1125 is located between the sixth circuit 1122 and the seventh circuit 1123, the diode 1124 is connected to the sixth circuit 1122, and the capacitor 1126 is connected to the seventh circuit 1123.
Further, the local dimming test fixture for the backlight module further comprises a circuit board, the signal processing module 11 and the current detection module 12 are respectively arranged on the circuit board (PCB), so that the manufacturing cost is reduced, other instruments are not required, and the local dimming test fixture is suitable for large-scale application.
Further, the microprocessor 111 (MCU) is provided with an ADC function pin, which is used for converting the analog signal collected by the current detection module 12 into a data signal for display; the current detection circuit sends the detected voltage value to the MCU through the third circuit 16, the ADC function of the MCU converts the analog signal of the acquired voltage value into a digital signal, and the MCU calculates the actual current value through the detected voltage value and then displays the current value on the display screen 13 to realize a visual information result.
Further, data transmission is performed between the microprocessor 111 and the backlight module 20 through SPI (Serial Peripheral interface), and the MCU drives the LED driver through SPI communication mode to realize the function of local dimming, wherein SPI is a serial peripheral interface, SPI is a high-speed, full duplex and synchronous communication bus, has the data transmission function, and occupies only four wires on the pins of MCU, so that the pins of a chip are saved, meanwhile, space is saved on the layout of a PCB, and convenience is provided.
Further, the local dimming test fixture for the backlight module further comprises a prompting lamp, the prompting lamp is electrically connected with the micro-processor 111, when the current or the voltage collected by the micro-processor 111 is an abnormal value, the prompting lamp is displayed in red, and when the current or the voltage collected by the micro-processor 111 is a normal value, the prompting lamp is displayed in green. The abnormal value refers to overload, short circuit or mismatch between the actual current value and the set current value of the backlight module 20.
In another preferred embodiment, the local dimming test fixture for the backlight module further comprises an alarm electrically connected to the microprocessor 111, and the alarm sends out an alarm prompt when the current or voltage collected by the microprocessor 111 is abnormal.
The present utility model is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (10)
1. The utility model provides a local dimming test tool for backlight unit, its characterized in that includes signal processing module (11), electric current detection module (12) and display screen (13), signal processing module (11) include electric connection's microprocessor (111) and DC-DC converter (112), DC-DC converter (112) pass through first circuit (14) and be connected with the negative pole of backlight unit (20), DC-DC converter (112) pass through second circuit (15) with the positive pole of backlight unit (20) is connected, electric current detection module (12) are connected on second circuit (15), electric current detection module (12) pass through third circuit (16) with microprocessor (111) electric connection, third circuit (16) are used for exporting electric current that electric current detection module (12) detected, backlight unit (20) and display screen (13) respectively with microprocessor (111) electric connection, display screen (13) are used for the electric current that detects.
2. The local dimming test jig for a backlight module according to claim 1, wherein the current detection module (12) comprises a sampling resistor (121) and a dual operational amplifier (122), the sampling resistor (121) is connected to the second circuit (15), the current detection module (12) further comprises a fourth circuit (124), the fourth circuit (124) is connected to two ends of the sampling resistor (121) along a current direction, the dual operational amplifier (122) is connected to the fourth circuit (124), and the third circuit (16) is used for connecting the dual operational amplifier (122) and the microprocessor (111).
3. The local dimming test jig for a backlight module according to claim 2, wherein the first circuit (14) is provided with an LED driver.
4. A local dimming test jig for a backlight module as claimed in claim 3, wherein the backlight module (20) comprises a plurality of light emitting units, and the LED driver is electrically connected to each of the light emitting units.
5. The local dimming test fixture for a backlight module according to claim 4, wherein the DC-DC converter (112) comprises a fifth circuit (1121), a sixth circuit (1122), a seventh circuit (1123), a diode (1124), an inductor (1125) and a capacitor (1126), the sixth circuit (1122), the seventh circuit (1123) are respectively arranged in parallel with the fifth circuit (1121), an input end of the fifth circuit (1121) is connected with a DC power supply, an output end of the fifth circuit (1121) is electrically connected with an anode of the backlight module (20), the inductor (1125) is connected to the fifth circuit (1121), the inductor (1125) is located between the sixth circuit (1122) and the seventh circuit (1123), the diode (1124) is connected to the sixth circuit (1122), and the capacitor (1126) is connected to the seventh circuit (1123).
6. The local dimming test jig for a backlight module according to claim 1, further comprising a circuit board, wherein the signal processing module (11) and the current detecting module (12) are respectively disposed on the circuit board.
7. The local dimming test fixture for a backlight module according to claim 6, wherein the microprocessor (111) is provided with an ADC function pin, and the ADC function pin is configured to convert an analog signal collected by the current detection module (12) into a data signal for display.
8. The local dimming test jig for a backlight module according to claim 7, wherein data transmission is performed between the microprocessor (111) and the backlight module (20) through an SPI.
9. The local dimming test jig for a backlight module according to claim 2, further comprising a warning lamp electrically connected to the micro processor (111), wherein the warning lamp is displayed in red when the current or voltage collected by the micro processor (111) is an abnormal value, and is displayed in green when the current or voltage collected by the micro processor (111) is a normal value.
10. The local dimming test jig for a backlight module according to claim 2, further comprising an alarm electrically connected to the microprocessor (111), wherein the alarm gives an alarm prompt when the current or voltage collected by the microprocessor (111) is an abnormal value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322343560.4U CN220584895U (en) | 2023-08-29 | 2023-08-29 | Local dimming test fixture for backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322343560.4U CN220584895U (en) | 2023-08-29 | 2023-08-29 | Local dimming test fixture for backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220584895U true CN220584895U (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322343560.4U Active CN220584895U (en) | 2023-08-29 | 2023-08-29 | Local dimming test fixture for backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220584895U (en) |
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2023
- 2023-08-29 CN CN202322343560.4U patent/CN220584895U/en active Active
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Address after: 516000 Factory Building, No.3 Baisha Road, Huinan High tech Industrial Park, Hui'ao Avenue, Huizhou City, Guangdong Province Patentee after: Huizhou Han Da Mei Electronics Co.,Ltd. Country or region after: China Address before: 516000 a2-01, floor 2, building AB, science and technology entrepreneurship center, No. 2, Huatai Road South, Huinan high tech Industrial Park, huiao Avenue, Huizhou City, Guangdong Province Patentee before: Huizhou Han Da Mei Electronics Co.,Ltd. Country or region before: China |