CN102866346B - Platform and method for testing light-emitting diode (LED) array drive efficiency - Google Patents

Platform and method for testing light-emitting diode (LED) array drive efficiency Download PDF

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CN102866346B
CN102866346B CN201210343294.9A CN201210343294A CN102866346B CN 102866346 B CN102866346 B CN 102866346B CN 201210343294 A CN201210343294 A CN 201210343294A CN 102866346 B CN102866346 B CN 102866346B
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led
switch
base
switches
row
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CN102866346A (en
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郭伟青
陈硕
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Abstract

The embodiment of the invention discloses a platform and a method for testing light-emitting diode (LED) array drive efficiency, and relates to the field of testing. The problem that a drive efficiency value cannot reach a designated value even if a drive chip is modified adaptively due to the characteristics of the drive chip is solved. The platform for testing the light-emitting diode array drive efficiency comprises an LED array, the drive chip and a plurality of switches, wherein the LED array comprises at least one row of LED light bars and a drive interface; each row of LED light bars comprises a plurality of LED bases independent to one another, and LED lamps arranged on the LED bases; the drive chip is connected with the LED array by the drive interface; and the plurality of switches are acted upon the LED array. The platform and the method can be applied to manufacturing LED backlight sources in a liquid crystal display device.

Description

Platform and method for testing LED array driving efficiency
Technical Field
The present invention relates to the field of testing, and in particular, to a platform and a method for testing driving efficiency of a Light Emitting Diode (LED) array.
Background
The LED backlight source is a backlight module which provides light source for the liquid crystal panel by using an LED array, wherein the LED array is composed of LED lamps which are combined in series and parallel. When an LED backlight is manufactured, only one series-parallel combination LED lamp is often manufactured, and a driving efficiency test is performed on the LED lamp of the combination method. At present, the driving efficiency generally needs to reach 90% or even more than 95%, and if the driving efficiency obtained by performing the driving efficiency test is smaller than a specified value, such as 90% or 95%, the driving chip needs to be adaptively modified.
In the process of implementing the embodiment of the present invention, the inventor finds that the prior art has at least the following problems: due to the characteristics of the driving chip, the driving efficiency cannot reach the specified value by adaptively modifying the driving chip, and the process of adaptively modifying the driving chip is complicated.
Disclosure of Invention
The platform and the method for testing the driving efficiency of the LED array are used for solving the problems that the driving efficiency value cannot reach a specified value due to adaptive modification of the driving chip caused by the characteristics of the driving chip, and the process of adaptively modifying the driving chip is complex.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
on one hand, the embodiment of the invention provides a platform for testing the driving efficiency of an LED array, which comprises the LED array, a driving chip and a plurality of switches, wherein the LED array comprises at least one row of LED lamp strips and a driving interface, and each row of LED lamp strips comprises a plurality of mutually independent LED bases and LED lamps arranged on the LED bases; the driving chip is connected with the LED array through the driving interface and used for driving the LED array; the switches act on the LED array to enable selective series-parallel connection between the LED lamps in the LED array.
Further, in order to facilitate control over the plurality of switches, the platform for testing the driving efficiency of the LED array further comprises a switch controller, and the plurality of switches comprise relays and/or analog switches; the I/O port of the switch controller is connected with the signal input ends of the switches through a conducting wire and is used for controlling the operation of the switches.
Specifically, the switch controller is a single chip microcomputer, a Field-Programmable Gate Array (Field-Programmable Gate Array, hereinafter abbreviated as FPGA), an ARM microprocessor or a Power PC.
Optionally, the plurality of switches are manually controlled switches.
Further, optionally, the switches include a plurality of switch units, each of the switch units includes a first switch, a second switch and a third switch;
the LED array comprises a row of LED lamp bars, and each LED base in the LED lamp bars is provided with one switch unit;
the first end of the first LED base in the LED lamp strip is connected to the first end of the driving interface, and the second end of the first LED base in the LED lamp strip is connected with the first switch of the corresponding switch unit;
the first switch in the switch unit enables the corresponding LED base to be connected in series with the next LED base, and the first switch corresponding to the last LED base is connected to the second end of the driving interface through the corresponding third switch, wherein the next LED base is the LED base which is in the same row with the corresponding LED base and is positioned on the right side of the corresponding LED base;
the second switches in the switch units are sequentially connected in series, the first end of the second switch corresponding to the first LED base is connected to the first end of the driving interface, and the second end of the second switch corresponding to the last LED base is connected to the second end of the driving interface;
the third switch in the switch unit is located between the corresponding first switch and second switch and is connected in series with the corresponding first switch and second switch.
Further, optionally, the LED array is an LED array including n rows of LED light bars, each row of LED light bars includes m mutually independent LED bases, where m and n are integers greater than or equal to 2;
the switches comprise m × n switch units and m × n-1 fourth switches, and each switch unit comprises a first switch, a second switch and a third switch;
each LED base is provided with one switch unit, each switch unit corresponding to the LED light bars in the 1 st row to the (n-1) th row is provided with one fourth switch, the first end of each fourth switch is connected with the second end of the corresponding LED base through the first switch of the corresponding switch unit, and the second end of each fourth switch is connected with the second end of the second switch of the corresponding switch unit in the next row of LED lights;
the first end of the 1 st LED base in each row of LED light bars is connected to the first end of the driving interface, and the second end of the LED base is connected to the first end of the first switch of the corresponding switch unit;
the first switch in the switch unit corresponding to the 1 st to the m-1 st LED bases in each row of LED light bars enables the corresponding LED base to be connected in series with the next LED base in the same row, for the 1 st row of LED light bars, the first switch corresponding to the m LED base is connected to the second end of the driving interface through the corresponding third switch, for the 2 nd to the n th rows of LED light bars, the first switch corresponding to the m LED base is connected to the fourth switch corresponding to the m LED base in the previous row of LED light bars through the corresponding third switch, wherein the next LED base in the same row is the LED base which is in the same row as the corresponding LED base and is positioned on the right of the LED base;
the second switches in the switch units corresponding to the LED bases in each row of LED light bars are sequentially connected in series, the first end of the second switch corresponding to the 1 st LED base in each row is connected to the first end of the driving interface, and the second end of the second switch corresponding to the m-th LED base is connected to the second end of the driving interface;
the third switch in the switch unit corresponding to each LED base in each row of LED lamp strips is positioned between the corresponding first switch and the corresponding second switch and is connected with the corresponding first switch and the corresponding second switch in series.
On the other hand, the invention also provides a method for testing the driving efficiency of the LED array, which is applied to a platform for testing the driving efficiency of the LED array, wherein the platform for testing the driving efficiency of the LED array comprises an LED array, a driving chip and a plurality of switches, the LED array comprises at least one row of LED lamp bars and a driving interface, and each row of LED lamp bars comprises a plurality of mutually independent LED bases and LED lamps arranged on the LED bases; the driving chip is connected with the LED array through the driving interface and used for driving the LED array; the plurality of switches act on the LED array to realize selective series-parallel connection among the LED lamps in the LED array, and the method comprises the following steps: the series-parallel connection of each LED lamp in the LED array is realized through the plurality of switches; measuring a voltage and a current at the drive interface; obtaining the driving efficiency of the LED array according to the voltage and the current at the driving interface and the power voltage and the power current supplied to the driving chip; and if the obtained LED array driving efficiency is smaller than a preset threshold value, changing the series-parallel connection structure of each LED lamp in the LED array through the on-off operation of the plurality of switches until the LED array driving efficiency is larger than or equal to the preset threshold value.
Further, in order to facilitate control over the plurality of switches, the platform for testing the driving efficiency of the LED array further comprises a switch controller, and the plurality of switches comprise relays and/or analog switches; the I/O port of the switch controller is connected with the signal input ends of the switches through a conducting wire and used for controlling the operation of the switches; the series-parallel connection of each LED lamp in the LED array is realized through the switches, and the method specifically comprises the following steps: controlling the on-off operation of a plurality of switches according to a control signal sent by a switch controller to realize the series-parallel connection of each LED lamp in the LED array;
if the obtained driving efficiency of the LED array is smaller than a preset threshold, adjusting the series-parallel relationship of each LED lamp in the LED array through the plurality of switches until the driving efficiency of the LED array is greater than or equal to the preset threshold, specifically including: and if the obtained LED array driving efficiency is smaller than a preset threshold value, the switch controller adjusts the on or off operation of the switches, and changes the series-parallel connection structure of each LED lamp in the LED array until the LED array driving efficiency is larger than or equal to the preset threshold value.
According to the platform and the method for testing the driving efficiency of the LED array, provided by the embodiment of the invention, the plurality of switches are used for acting on the LED array, so that the selective series-parallel connection between the LED lamps in the LED array is realized, when the driving efficiency of the LED array is tested, the series-parallel connection structure between the LED lamps in the LED array is variable through the on-off operation of the plurality of switches, the load of the driving chip is changed, the driving efficiency of the LED array is adjusted through changing the load of the driving chip to reach a specified value (namely a preset threshold value), and the problems that in the prior art, the driving efficiency value cannot reach the specified value due to the adaptive modification of the driving chip caused by the characteristic of the driving chip, and the process of adaptively modifying the driving chip is complicated are solved.
Drawings
Fig. 1 is a first schematic structural diagram of a platform for testing driving efficiency of an LED array according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram ii of a platform for testing driving efficiency of an LED array according to an embodiment of the present invention;
FIG. 3(a) is a first schematic circuit diagram of the LED array shown in FIGS. 1 and 2 connected to a plurality of switches;
FIG. 3(b) is a second schematic circuit diagram of the LED array shown in FIGS. 1 and 2 connected to a plurality of switches;
FIG. 3(c) is a schematic circuit diagram of a multi-row LED array coupled to a plurality of relays;
FIG. 4 is a flowchart of a method for testing the driving efficiency of an LED array according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for testing driving efficiency of an LED array according to another embodiment of the present invention.
Reference numerals:
1-an LED array; 11-a LED light bar; 111-an LED base; 112-LED lamps; 12-a drive interface; 2-a driving chip; 3, switching; 31-a first switch; 32-a second switch; 33-a third switch; 34-a fourth switch; 35-a switching unit; 4-switch controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems that in the prior art, due to the characteristics of a driving chip, the driving efficiency value cannot reach a specified value even if the driving chip is adaptively modified, and the process of adaptively modifying the driving chip is relatively complex, the embodiment of the invention provides a platform and a method for testing the driving efficiency of an LED array.
As shown in fig. 1, an embodiment of the present invention provides a platform for testing driving efficiency of an LED array, including an LED array 1, a driving chip 2, and a plurality of switches 3, where the LED array 1 includes at least one row of LED light bars 11 and a driving interface 12, and each row of LED light bars 11 includes a plurality of independent LED bases 111 and LED lights 112 disposed on the LED bases 111; the driving chip 2 is connected with the LED array 1 through the driving interface 12, and is configured to drive the LED array 1; the switches 3 act on the LED array 1, so that each LED lamp in the LED array 1 can be independently turned on and off, or connected in series or in parallel with at least one other LED lamp.
Optionally, the switches may be manual control switches, and the switches are switched on and off by manual control, and the switches are connected with the LED array through wires.
Optionally, in order to facilitate control over the plurality of switches, as shown in fig. 2, the platform for testing the driving efficiency of the LED array further includes a switch controller 4, and the plurality of switches may include relays and/or analog switches; the I/O port of the switch controller 4 is connected to the signal input terminals of the switches by a wire for controlling the operation of the switches.
The relay generally comprises an iron core, a coil, an armature, a contact spring and the like, wherein a certain current flows in the coil only by applying a certain voltage to two ends of the coil, so that an electromagnetic effect is generated, the armature overcomes the pulling force of a return spring and is attracted to the iron core under the attraction effect of electromagnetic force, and then the movable contact of the armature is driven to be attracted to a fixed contact (normally open contact). When the coil is powered off, the electromagnetic attraction force disappears, and the armature returns to the original position under the counterforce of the spring, so that the movable contact and the original static contact (normally closed contact) are released. Thus, the circuit is attracted and released, thereby achieving the purposes of conduction and disconnection in the circuit. For the "normally open, normally closed" contacts of a relay, a distinction can be made: the static contact which is in an off state when the relay coil is not electrified is called as a normally open contact; the stationary contact in the on state is referred to as a "normally closed contact". A single-coil signal relay can be used as a switch to control a line; the double-coil signal relay can be used as two switches to control two lines.
The analog switch may be a switching transistor, which is switched by a control signal, and is called an analog switch because it functions as a switch and is actually a transistor.
Specifically, in this embodiment, the switch controller may be a single chip microcomputer, an FPGA, an ARM, or a Power PC.
The singlechip is an integrated circuit chip, and is a small and perfect microcomputer system formed by integrating a central processing unit CPU with data processing capacity, a random access memory RAM, a read only memory ROM, various I/O ports, interrupt systems, a timer/timer and other functions (possibly comprising a display driving circuit, a pulse width modulation circuit, an analog multiplexer, an A/D converter and other circuits) on a silicon chip by adopting a super-large scale integrated circuit technology;
the FPGA is used as a semi-custom circuit in the field of Application Specific Integrated Circuits (ASIC), which not only solves the defects of the custom circuit, but also overcomes the defect that the gate circuit number of the original programmable device is limited;
ARM is an advanced RISC microprocessor, which itself is a 32-bit design, but is also equipped with a 16-bit instruction set. Generally saving up to 35% over an equivalent 32-bit code, while retaining all the advantages of a 32-bit system;
power PCs are a family of high-performance 32-bit and 64-bit RISC microprocessors developed jointly by IBM (International Business machines corporation) Motorola (Motorola corporation) and Apple (Apple corporation).
Further, as shown in fig. 3(a), the switches include switch units 35, and each switch unit 35 includes a first switch 31, a second switch 32, and a third switch 33;
the LED1 array is an LED array including a row of LED light bars 11, and each LED base 111 in the LED light bars 11 is provided with one of the switch units 31.
In this embodiment, a right access end of the LED base 111 is referred to as a first end of the LED base, and a left access end of the LED base 111 is referred to as a second end of the LED base 111; the first switch 31, the second switch 32 and the third switch 33 in the switch unit 35 each include two access ports accessing the LED array 1, wherein one access port is referred to as a first end of the first switch 31, the second switch 32 or the third switch 33, and the other access port is referred to as a second end of the first switch 31, the second switch 32 or the third switch 33.
The following describes in detail the connection relationship between the LED base 111 and the switch unit and other LED bases 111 when the LED base 111 is at different positions in the LED light bar 11:
one) the LED base 111 is the first LED base in the LED light bar 11;
the first end of the first LED base in the LED lamp strip 11 is connected into the first end of the driving interface 12, the second end of the first LED base is connected with the second LED base in series through the corresponding first switch, the first LED base is also connected with the corresponding second switch in parallel, the first end of the first LED base is connected with the first end of the corresponding second switch, the second end of the second switch corresponding to the first LED base is connected with the second end of the first LED base through the corresponding third switch and the corresponding first switch, so that the first LED base is short-circuited when three switches of the switch unit corresponding to the first LED base are all closed.
Wherein, the second end of first LED base is established ties through corresponding first switch and second LED base, specifically is:
the second end of the first LED base is connected with the first end of the corresponding first switch, the second end of the corresponding first switch is connected with the first end of the second LED base, and when the first switch corresponding to the first LED base is closed, the first LED base is connected with the second LED base in series.
The second end of the second switch corresponding to the first LED base is connected with the second end of the first LED base through the corresponding third switch and the first switch, and the method specifically comprises the following steps:
the second end of the second switch corresponding to the first LED base is connected with the first end of the corresponding third switch, and the second end of the corresponding third switch is connected with the second end of the corresponding first switch, so that when the first switch corresponding to the first LED base and the third switch corresponding to the first LED base are closed, the first LED base is connected with the corresponding second switch in parallel.
Two) the LED base 111 is the last LED base in the LED light bar 11;
a first end of a last LED base in the LED light bar 11 is connected in series with a penultimate LED base through a first switch corresponding to the penultimate LED base, a second end of the last LED base is connected to a second end of the driving interface 12 through a corresponding first switch and a corresponding third switch, the last LED base is further connected in parallel with a corresponding second switch, a first end of a second switch corresponding to the last LED base is connected to the first end of the last LED base through a third switch corresponding to the penultimate LED base and connected to a second end of a second switch corresponding to the penultimate LED base, a second end of a second switch corresponding to the last LED base is connected to the second end of the last LED base through a third switch corresponding to the last LED base and the first switch, so that three switches of a switch unit corresponding to the last LED base and a switch unit corresponding to the penultimate LED base are connected to the three switches of the switch unit corresponding to the last LED base and the switch unit corresponding to the penultimate LED base The last LED submount is shorted when the third switches are all closed.
The first end of the last LED base in the LED light bar 11 is connected in series with the penultimate LED base through a first switch corresponding to the penultimate LED base, specifically:
the first end of the last LED base is connected with the second end of the first switch corresponding to the penultimate LED base, and the first end of the first switch corresponding to the penultimate LED base is connected with the penultimate LED base, so that when the first switch corresponding to the penultimate LED base is closed, the last LED base is connected with the penultimate LED base in series.
The second end of the last LED base is connected to the second end of the driving interface 12 through a corresponding first switch and a corresponding third switch, specifically:
the second end of the last LED base is connected to the first end of the corresponding first switch, the second end of the corresponding first switch is connected to the second end of the corresponding third switch, the first end of the corresponding third switch is connected to the second end of the driving interface 12, and when the first switch corresponding to the last LED base and the corresponding third switch are both closed, the last LED base is connected to the driving interface.
The first end of the second switch corresponding to the last LED base is connected with the first end of the last LED base through the third switch corresponding to the last LED base, and the method specifically comprises the following steps:
the first end of the second switch corresponding to the last LED base is connected with the first end of the third switch corresponding to the penultimate LED base, and the second end of the third switch corresponding to the penultimate LED base is connected with the first end of the last LED base.
The second end of the second switch corresponding to the last LED base is connected with the second end of the last LED base through the third switch and the first switch corresponding to the last LED base, and the method specifically comprises the following steps:
the second end of the second switch corresponding to the last LED base is connected with the first end of the third switch corresponding to the last LED base, the second end of the third switch corresponding to the last LED base is connected with the second end of the first switch corresponding to the last LED base, and the first end of the first switch corresponding to the last LED base is connected with the second end of the last LED base.
Thirdly), the LED base 111 is a middle LED base in the LED light bar 11;
the first end of the middle LED base in the LED lamp strip 11 is connected in series with the previous LED base through the first switch corresponding to the previous LED base, the second end of the middle LED base is connected in series with the next LED base through the corresponding first switch, the middle LED base is also connected in parallel with the corresponding second switch, the first end of the second switch corresponding to the middle LED base is connected with the first end of the middle LED base through the third switch corresponding to the previous LED base, and the second end of the second switch corresponding to the middle LED base is connected with the second end of the middle LED base through the third switch and the first switch corresponding to the middle switch, so that the middle LED base is short-circuited when the third switch corresponding to the previous LED base and the three switches of the switch units corresponding to the middle LED base are all closed.
The middle LED base is the other LED bases except the first LED base and the last LED base in the LED light bar; the previous LED base is the LED base which is in the same row with the middle LED base and is positioned on the left side of the LED base; the latter LED base is the LED base that middle LED base is the same row and is located LED base the right side.
The first end of the middle LED base is connected in series with the previous LED base through a first switch corresponding to the previous LED base, and the method specifically comprises the following steps:
the first end of the middle LED base is connected with the second end of the first switch corresponding to the previous LED base, and the first end of the first switch corresponding to the previous LED base is connected with the second end of the previous LED base, so that when the first switch corresponding to the previous LED base is closed, the middle LED base is connected with the previous LED base in series.
The second end of middle LED base is established ties with the next LED base through the first switch that corresponds, specifically is:
the second end of the middle LED base is connected with the first end of the corresponding first switch, and the second end of the corresponding first switch is connected with the first end of the next LED base, so that when the corresponding first switch is closed, the middle LED base is connected with the next LED base in series.
The first end of the second switch corresponding to the middle LED base is connected with the first end of the middle LED base through the third switch corresponding to the previous LED base, and the method specifically comprises the following steps:
the first end of the second switch corresponding to the middle LED base is connected with the first end of the third switch corresponding to the previous LED base, and the second end of the third switch corresponding to the previous LED base is connected with the first end of the middle LED base.
The second end of the second switch corresponding to the middle LED base is connected with the second end of the middle LED base through the third switch and the first switch corresponding to the middle LED, and the method specifically comprises the following steps:
the second end of the second switch corresponding to the middle LED base is connected with the first end of the third switch corresponding to the middle LED base, the second end of the third switch corresponding to the middle LED base is connected with the second end of the first switch corresponding to the middle LED base, and the first end of the first switch corresponding to the middle LED base is connected with the second end of the middle LED base.
Further, specifically, optionally, as shown in fig. 3(b), the LED array is an LED array including n rows of LED light bars 11, each row of LED light bars 11 includes m independent LED bases 111, where m and n are integers greater than or equal to 2.
The switches include m × n switch units 35 and m × n-1 fourth switches 34, and each of the switch units 35 includes a first switch 31, a second switch 32, and a third switch 33.
Every LED base 111 all is provided with one switch element 35, every switch element 35 corresponding to 1 st row to the n-1 st row LED lamp strip 11 all is provided with one fourth switch 34, the first end of fourth switch 34 is connected with the second end of the LED base 111 that corresponds through the first switch 31 of the switch element 35 that corresponds, the second end of fourth switch 35 is connected with the second end of the second switch 32 of the switch element 35 that corresponds in the next row LED lamp strip 11.
The following describes in detail the connection relationship between the LED base 111 and the switch unit and other LED bases 111 when the LED base 111 is at different positions in the LED light bar 11:
one) the LED base 111 is the first LED base in the LED light bar 11;
the first end of the first LED base in every row of LED lamp strips 11 all inserts the first end of drive interface 12, the second end of first LED base is established ties with the second LED base of arranging with through the first switch that corresponds, first LED base in every row of LED lamp strips 11 still connects in parallel has the second switch that corresponds, the first end of first LED base is connected with the first end of the second switch that corresponds, the second end of first LED base is connected with the second end of the second switch that corresponds through the first switch that corresponds and third switch, makes when the three switch of the switch unit that first LED base corresponds all closed, first LED base is by the short circuit.
Two) the LED base 111 is the last LED base in the LED light bar 11;
the first end of the last LED base in each row of LED light bars 11 is connected in series with the penultimate LED base in the same row through a first switch corresponding to the penultimate LED base in the same row, the second end of the last LED base in the 1 st row is connected to the second end of the driving interface 12 through a corresponding first switch and a corresponding third switch, and the second end of the last LED base in the 2 nd row to the nth row is connected to a fourth switch corresponding to the last LED base in the last row of LED light bars through a corresponding first switch and a corresponding third switch; the last LED base in each row of LED light bars is also connected with a corresponding second switch in parallel, the first end of the second switch corresponding to the last LED base is connected with the first end of the last LED base through a third switch corresponding to the last LED base and is connected with the second end of the second switch corresponding to the last LED base in the same row, and the second end of the second switch corresponding to the last LED base is connected with the second end of the last LED base through the third switch and the first switch corresponding to the last LED base, so that when the three switches of the switch unit corresponding to the last LED base and the third switch of the switch unit corresponding to the last LED base are closed, the last LED base is short-circuited.
Thirdly), the LED base 111 is a middle LED base in the LED light bar 11;
the first end of the middle LED base in each row of LED light bars 11 is connected in series with the previous LED base through the first switch corresponding to the previous LED base, the second end of the middle LED base is connected with the next LED base in series through the corresponding first switch, the middle LED base in each row of LED light bars 11 is further connected in parallel with a corresponding second switch, the first end of the second switch corresponding to the middle LED base is connected with the first end of the middle LED base through the third switch corresponding to the previous LED base, the second end of the second switch corresponding to the middle LED base is connected with the second end of the middle LED base through the third switch and the first switch corresponding to the middle LED base, when the third switch corresponding to the previous LED base and the three switches of the switch unit corresponding to the middle LED base are closed, the middle LED base is short-circuited;
the middle LED base is the other LED bases except the first LED base and the last LED base in the LED light bar; the previous LED base is the LED base which is in the same row with the middle LED base and is positioned on the left side of the LED base; the latter LED base is the LED base that middle LED base is the same row and is located LED base the right side.
In this embodiment, the LED array is a plurality of rows of LED light bars, and the switch is a relay, for example, and after the switch controller sends out an instruction, the relay K21, K31, and K12...... K1n in fig. 3(c) is in a normally closed contact, so that a circuit is turned on, and other relays are in normally open contacts, so that the circuit is disconnected, and therefore, the LED lamp disposed on the LED base D11 is turned on, and other LED lamps are turned off. By analogy, the LEDs of each of the arrays may be illuminated individually. Or after the switch controller sends out an instruction, the relay devices K31, K32 and K3 in the step (c) of FIG. 3 are enabled to be connected; k71, K72,.. K7 (10); k2(10), K4(10), K6 (10); k1(11), K1(12), K1n are in normally closed contact, conduct the circuit, and other relays are in normally open contact, and the circuit is broken, can realize 10 cluster 2 parallel integrated configuration, i.e. 10 LEDs connect in series to be one row, connect 2 such LED lamps in parallel. By analogy, various serial-parallel combined structures can be realized.
It should be noted that the LED array, the switches and the switch controller provided in this embodiment may be integrated on a PCB.
In addition, except the relay, all other similar structures can realize the combination relationship in the protection range.
According to the platform for testing the driving efficiency of the LED array, which is provided by the embodiment of the invention, the plurality of switches act on the LED array, so that each LED lamp in the LED array can be independently turned on or off, or selective series-parallel connection with at least one other LED lamp is realized, when the driving efficiency of the LED array is tested, the series-parallel connection structure of each LED lamp in the LED array is variable through the on-off operation of the plurality of switches, the load of the driving chip is changed, the driving efficiency of the LED array is adjusted through changing the load of the driving chip to reach a specified value (namely a preset threshold value), and the problems that in the prior art, due to the characteristics of the driving chip, the driving efficiency value cannot be reached to the specified value through adaptive modification of the driving chip, and the process of adaptively modifying the driving chip is relatively complex are solved.
An embodiment of the present invention further provides a method for testing driving efficiency of an LED array, as shown in fig. 4, where a platform for testing driving efficiency of an LED array is provided, and a structure of the platform for testing driving efficiency of an LED array is the same as that shown in fig. 1 in the first embodiment, and is not described here again, and the method includes:
401. and the series-parallel connection of the LED lamps in the LED array is realized through the plurality of switches.
402. Measuring a voltage and a current at the drive interface.
403. And obtaining the driving efficiency of the LED array according to the voltage and the current at the driving interface and the power voltage and the power current supplied to the driving chip.
In this embodiment, the LED array driving efficiency P is specifically:
P＝(U1I1/U2I2)*100％
wherein, U1To drive the voltage at the interface, I1To drive the current at the interface, U2Is the supply voltage of the driver chip, I2Is the power supply current of the driving chip.
404. And if the obtained LED array driving efficiency is smaller than a preset threshold value, changing the series-parallel connection structure of each LED lamp in the LED array through the on-off operation of the plurality of switches until the LED array driving efficiency is larger than or equal to the preset threshold value.
According to the method for testing the driving efficiency of the LED array, provided by the embodiment of the invention, the plurality of switches are used for acting on the LED array, so that each LED lamp in the LED array can be independently turned on or off, or selective series-parallel connection with at least one other LED lamp is realized, when the driving efficiency of the LED array is tested, the series-parallel connection structure of each LED lamp in the LED array is variable through the on-off operation of the plurality of switches, the load of the driving chip is changed, the driving efficiency of the LED array is adjusted through changing the load of the driving chip to reach a specified value (namely a preset threshold value), and the problems that in the prior art, the driving chip cannot be adaptively modified to reach the specified value due to the characteristics of the driving chip, and the process of adaptively modifying the driving chip is relatively complex are solved.
In order to solve the problems that the driving efficiency value cannot be achieved by adaptively modifying the driving chip due to the characteristics of the driving chip in the prior art and the process of adaptively modifying the driving chip is relatively complicated, and to facilitate the control of the plurality of switches, as shown in fig. 5, a platform for testing the driving efficiency of the LED array according to another embodiment of the present invention is provided, and the structure of the platform for testing the driving efficiency of the LED array is the same as the structure shown in fig. 2 in the first embodiment, and is not described herein again, and the method includes:
501. and controlling the on-off operation of the switches according to the control signals sent by the switch controller to realize the series-parallel connection of the LED lamps in the LED array.
502. Measuring a voltage and a current at the drive interface.
503. And obtaining the driving efficiency of the LED array according to the voltage and the current at the driving interface and the power voltage and the power current supplied to the driving chip.
In this embodiment, the LED array driving efficiency P is specifically:
P＝(U1I1/U2I2)*100％
wherein, U1To drive the voltage at the interface, I1To drive the current at the interface, U2Is the supply voltage of the driver chip, I2Is the power supply current of the driving chip.
504. And if the obtained LED array driving efficiency is smaller than a preset threshold value, the switch controller adjusts the on or off operation of the switches, and changes the series-parallel connection structure of each LED lamp in the LED array until the LED array driving efficiency is larger than or equal to the preset threshold value.
According to the method for testing the driving efficiency of the LED array, provided by the embodiment of the invention, the plurality of switches are used for acting on the LED array, so that each LED lamp in the LED array can be independently turned on or off, or selective series-parallel connection with at least one other LED lamp is realized, when the driving efficiency of the LED array is tested, the series-parallel connection structure of each LED lamp in the LED array is variable through the on-off operation of the plurality of switches, the load of the driving chip is changed, the driving efficiency of the LED array is adjusted through changing the load of the driving chip to reach a specified value (namely a preset threshold value), and the problems that in the prior art, the driving chip cannot be adaptively modified to reach the specified value due to the characteristics of the driving chip, and the process of adaptively modifying the driving chip is relatively complex are solved.
The platform and the method for testing the driving efficiency of the LED array provided by the embodiment of the invention can be applied to the manufacture of LED backlight sources in liquid crystal display devices.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer readable storage medium, such as ROM/RAM, magnetic or optical disk, etc.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (6)

1. A platform for testing the driving efficiency of a Light Emitting Diode (LED) array is characterized by comprising the LED array, a driving chip and a plurality of switches,
the LED array comprises at least one row of LED lamp strips and a driving interface, wherein each row of LED lamp strips comprises a plurality of mutually independent LED bases and LED lamps arranged on the LED bases;
the driving chip is connected with the LED array through the driving interface and used for driving the LED array;
the plurality of switches act on the LED array to enable each LED lamp in the LED array to be independently turned on or off, or to be connected with at least one other LED lamp in the LED array in series or in parallel;
wherein the switches comprise a plurality of switch units, each switch unit comprising a first switch, a second switch and a third switch;
the LED array comprises a row of LED lamp bars, and each LED base in the LED lamp bars is provided with one switch unit;
the first ends of the first LED bases in the LED lamp strips are connected to the first end of the driving interface, and the second ends of the first LED bases are connected with the first switches of the corresponding switch units;
the first switch in the switch unit enables the corresponding LED base to be connected in series with the next LED base, and the first switch corresponding to the last LED base is connected to the second end of the driving interface through the corresponding third switch, wherein the next LED base is the LED base which is in the same row with the corresponding LED base and is positioned on the right side of the corresponding LED base;
the second switches in the switch units are sequentially connected in series, the first end of the second switch corresponding to the first LED base is connected to the first end of the driving interface, and the second end of the second switch corresponding to the last LED base is connected to the second end of the driving interface;
a third switch in the switch unit is positioned between and connected in series with the corresponding first switch and the second switch;
or,
the LED array comprises n rows of LED light bars, each row of LED light bars comprises m mutually independent LED bases, wherein m and n are integers more than or equal to 2;
the switches comprise m × n switch units and m × n-1 fourth switches, and each switch unit comprises a first switch, a second switch and a third switch;
each LED base is provided with one switch unit, each switch unit corresponding to the LED light bars in the 1 st row to the (n-1) th row is provided with one fourth switch, the first end of each fourth switch is connected with the second end of the corresponding LED base through the first switch of the corresponding switch unit, and the second end of each fourth switch is connected with the second end of the second switch of the corresponding switch unit in the next row of LED lights;
the first end of the 1 st LED base in each row of LED light bars is connected to the first end of the driving interface, and the second end of the LED base is connected to the first end of the first switch of the corresponding switch unit;
the first switch in the switch unit corresponding to the 1 st to the m-1 st LED bases in each row of LED light bars enables the corresponding LED base to be connected in series with the next LED base in the same row, for the 1 st row of LED light bars, the first switch corresponding to the m LED base is connected to the second end of the driving interface through the corresponding third switch, for the 2 nd to the n th rows of LED light bars, the first switch corresponding to the m LED base is connected to the fourth switch corresponding to the m LED base in the previous row of LED light bars through the corresponding third switch, wherein the next LED base in the same row is the LED base which is in the same row as the corresponding LED base and is positioned on the right of the LED base;
the second switches in the switch units corresponding to the LED bases in each row of LED light bars are sequentially connected in series, the first end of the second switch corresponding to the 1 st LED base in each row is connected to the first end of the driving interface, and the second end of the second switch corresponding to the m-th LED base is connected to the second end of the driving interface;
the third switch in the switch unit corresponding to each LED base in each row of LED lamp strips is positioned between the corresponding first switch and the corresponding second switch and is connected with the corresponding first switch and the corresponding second switch in series.
2. The platform for testing the driving efficiency of LED arrays according to claim 1, further comprising a switch controller,
the plurality of switches comprise relays and/or analog switches;
the I/O port of the switch controller is connected with the signal input ends of the switches through a conducting wire and is used for controlling the operation of the switches.
3. The platform of claim 2, wherein the switch controller is a single chip, FPGA, ARM or Power PC.
4. The platform for testing driving efficiency of an LED array according to claim 1, wherein the plurality of switches are manually controlled switches.
5. The method for testing the driving efficiency of the LED array is characterized by being applied to a platform for testing the driving efficiency of the LED array, wherein the platform for testing the driving efficiency of the LED array comprises the LED array, a driving chip and a plurality of switches, the LED array comprises at least one row of LED lamp strips and a driving interface, and each row of LED lamp strips comprises a plurality of mutually independent LED bases and LED lamps arranged on the LED bases; the driving chip is connected with the LED array through the driving interface and used for driving the LED array; the plurality of switches act on the LED array to enable each LED lamp in the LED array to be individually turned on or off, or to be connected in series or in parallel with at least one other LED lamp in the LED array, the method comprising:
each LED lamp in the LED array can be independently turned on or off or connected with at least one other LED lamp in the LED array in series or in parallel through the plurality of switches;
measuring a voltage and a current at the drive interface;
obtaining the driving efficiency of the LED array according to the voltage and the current at the driving interface and the power voltage and the power current supplied to the driving chip;
if the obtained LED array driving efficiency is smaller than a preset threshold value, changing the series-parallel connection structure of each LED lamp in the LED array through the on-off operation of the switches until the LED array driving efficiency is larger than or equal to the preset threshold value;
wherein the switches comprise a plurality of switch units, each switch unit comprising a first switch, a second switch and a third switch;
the LED array comprises a row of LED lamp bars, and each LED base in the LED lamp bars is provided with one switch unit;
the first ends of the first LED bases in the LED lamp strips are connected to the first end of the driving interface, and the second ends of the first LED bases are connected with the first switches of the corresponding switch units;
the first switch in the switch unit enables the corresponding LED base to be connected in series with the next LED base, and the first switch corresponding to the last LED base is connected to the second end of the driving interface through the corresponding third switch, wherein the next LED base is the LED base which is in the same row with the corresponding LED base and is positioned on the right side of the corresponding LED base;
the second switches in the switch units are sequentially connected in series, the first end of the second switch corresponding to the first LED base is connected to the first end of the driving interface, and the second end of the second switch corresponding to the last LED base is connected to the second end of the driving interface;
a third switch in the switch unit is positioned between and connected in series with the corresponding first switch and the second switch;
or,
the LED array comprises n rows of LED light bars, each row of LED light bars comprises m mutually independent LED bases, wherein m and n are integers more than or equal to 2;
the switches comprise m × n switch units and m × n-1 fourth switches, and each switch unit comprises a first switch, a second switch and a third switch;
each LED base is provided with one switch unit, each switch unit corresponding to the LED light bars in the 1 st row to the (n-1) th row is provided with one fourth switch, the first end of each fourth switch is connected with the second end of the corresponding LED base through the first switch of the corresponding switch unit, and the second end of each fourth switch is connected with the second end of the second switch of the corresponding switch unit in the next row of LED lights;
the first end of the 1 st LED base in each row of LED light bars is connected to the first end of the driving interface, and the second end of the LED base is connected to the first end of the first switch of the corresponding switch unit;
the first switch in the switch unit corresponding to the 1 st to the m-1 st LED bases in each row of LED light bars enables the corresponding LED base to be connected in series with the next LED base in the same row, for the 1 st row of LED light bars, the first switch corresponding to the m LED base is connected to the second end of the driving interface through the corresponding third switch, for the 2 nd to the n th rows of LED light bars, the first switch corresponding to the m LED base is connected to the fourth switch corresponding to the m LED base in the previous row of LED light bars through the corresponding third switch, wherein the next LED base in the same row is the LED base which is in the same row as the corresponding LED base and is positioned on the right of the LED base;
the second switches in the switch units corresponding to the LED bases in each row of LED light bars are sequentially connected in series, the first end of the second switch corresponding to the 1 st LED base in each row is connected to the first end of the driving interface, and the second end of the second switch corresponding to the m-th LED base is connected to the second end of the driving interface;
the third switch in the switch unit corresponding to each LED base in each row of LED lamp strips is positioned between the corresponding first switch and the corresponding second switch and is connected with the corresponding first switch and the corresponding second switch in series.
6. The method of claim 5, wherein the platform for testing LED array drive efficiency further comprises a switch controller, the plurality of switches comprising relays and/or analog switches; the I/O port of the switch controller is connected with the signal input ends of the switches through a conducting wire and used for controlling the operation of the switches; the method for realizing that each LED lamp in the LED array can be independently turned on or off through the plurality of switches, or connected in series or in parallel with at least one other LED lamp in the LED array specifically includes:
controlling the on-off operation of a plurality of switches according to a control signal sent by a switch controller, so that each LED lamp in an LED array can be independently turned on or off, or is connected with at least one other LED lamp in the LED array in series or in parallel;
if the obtained driving efficiency of the LED array is smaller than a preset threshold, adjusting the series-parallel relationship of each LED lamp in the LED array through the plurality of switches until the driving efficiency of the LED array is greater than or equal to the preset threshold, specifically including:
and if the obtained LED array driving efficiency is smaller than a preset threshold value, the switch controller adjusts the on or off operation of the switches, and changes the series-parallel connection structure of each LED lamp in the LED array until the LED array driving efficiency is larger than or equal to the preset threshold value.
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