CN110570822A - Redundant light bar driving circuit and method - Google Patents
Redundant light bar driving circuit and method Download PDFInfo
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- CN110570822A CN110570822A CN201910755078.7A CN201910755078A CN110570822A CN 110570822 A CN110570822 A CN 110570822A CN 201910755078 A CN201910755078 A CN 201910755078A CN 110570822 A CN110570822 A CN 110570822A
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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
- G09G3/3406—Control of illumination source
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/08—Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
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Abstract
The invention is suitable for the technical field of light bar driving, and provides a redundant light bar driving circuit and a method, wherein the redundant light bar driving circuit comprises: a power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit, and can control switching; the power conversion circuit is respectively connected with the backlight drive controller, the light bar switch switching circuit and the current return circuit, and the light bar switch switching circuit and the current return circuit are respectively connected with the backlight drive controller. The invention solves the problems of low reliability and short service life of the liquid crystal screen in the prior art, and further realizes high reliability and long service life of the liquid crystal screen.
Description
Technical Field
The invention belongs to the technical field of light bar driving, and particularly relates to a redundant light bar driving circuit and a redundant light bar driving method.
background
with the development of smart cities, outdoor high-brightness display devices are more and more widely applied, and the most widely applied liquid crystal display devices are high-resolution and large-size liquid crystal display screens. Because the brightness of outdoor environment is very high, the liquid crystal screen needs very high power to drive backlight in order to realize high brightness, which leads to very high power density and temperature rise of backlight lamp strips, thousands of lamp beads are adopted in the large-screen liquid crystal screen, and as long as one lamp bead is damaged, black stripes appear on the liquid crystal screen, so that how to realize high reliability and long service life brings very great challenge. Therefore, the liquid crystal display screen in the prior art has the problems of low reliability and short service life.
Disclosure of Invention
The embodiment of the invention provides a redundant light bar driving circuit, and aims to solve the problems of low reliability and short service life of a liquid crystal display screen in the prior art.
The embodiment of the invention provides a redundant light bar driving circuit, which comprises: a power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit, and can control switching; the power conversion circuit is respectively connected with the backlight drive controller, the light bar switch switching circuit and the current return circuit, and the light bar switch switching circuit and the current return circuit are respectively connected with the backlight drive controller.
Still further, the dual redundant lamp set includes: a first redundant light bar and a second redundant light bar; the positive electrode of the first redundant light bar is connected with a power conversion circuit, and the negative electrode of the first redundant light bar is connected with the light bar switch switching circuit; the second redundant lamp bar anode is arranged on a connecting line between the first redundant lamp bar anode and the power conversion circuit, and the second redundant lamp bar cathode is connected with the current return circuit.
furthermore, the power supply conversion circuit is connected with the backlight drive controller through a lamp set driving current signal;
The light bar switch switching circuit is connected with the backlight drive controller through a first light bar enabling signal and a first testing current signal, and the first light bar enabling signal and the first testing current signal correspond to the first redundant light bar;
The current return test circuit is connected with the backlight drive controller through a second lamp bar enabling signal and a second return test current signal, and the second lamp bar enabling signal and the second return test current signal correspond to the second redundant lamp bar.
furthermore, the back light drive controller is an ARM processor.
Further, the power conversion circuit includes: a DCDC converter.
the embodiment of the invention provides a redundant light bar driving method, which is used in the redundant light bar driving circuit provided by the embodiment and comprises the following steps:
When a power supply signal is detected, adjusting the backlight driving constant current value and outputting the constant current value to the power supply conversion circuit;
Opening each group of dual redundant lamp groups according to the backlight driving constant current value and an enabling signal; the enabling signal corresponds to the dual redundant light group, and comprises a first light bar enabling signal for controlling a first redundant light bar and a second light bar enabling signal for controlling a second redundant light bar;
detecting the current value of each group of dual redundant lamp groups;
judging whether the dual redundant lamp set has a fault according to the current value of the dual redundant lamp set and the backlight driving constant current value;
and if the fault exists, switching control is carried out on the dual redundant lamp group.
Still further, the step of detecting the current value of each dual redundant lamp set comprises:
Detecting a first return current signal of the first redundant lamp bar and converting the first return current signal into a first return current value;
Detecting a second return current signal of the second redundant lamp bar and converting the second return current signal into a second return current value;
Under normal conditions, the first return current value is the same as the second return current value, and the sum of the first return current value and the second return current value is equal to the backlight driving constant current value.
further, the step of determining whether the dual redundant lamp set has a fault according to the dual redundant lamp set current value and the backlight driving constant current value includes:
summing the first measured return current value and the second measured return current value;
and if the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, judging that the dual redundant lamp set has a fault.
furthermore, if the sum of the first and second return current values is not equal to the backlight driving constant current value, the step of determining that the dual redundant lamp set has a fault includes:
Presetting a preset current value, wherein under the normal condition, the preset current value of the first return current value is equal to the preset current value of the second return current value, and the sum of the preset current value of the first return current value and the preset current value of the second return current value is equal to the backlight driving constant current value;
If the first return current value is lower than the preset current value and the second return current value is lower than the preset current value, judging that the first redundant lamp strip and the second redundant lamp strip in the dual redundant lamp set both have faults if the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value;
If the first return current value is lower than the preset current value and the second return current value is equal to the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the first redundant lamp strip in the dual redundant lamp set is judged to be in fault;
Or if the first return current value is equal to the preset current value and the second return current value is lower than the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the second redundant lamp bar in the dual redundant lamp set is judged to be in fault.
Further, the step of performing switching control on the dual redundant lamp set if there is a fault includes:
if the first redundant light bar and the second redundant light bar in the dual redundant light group both fail, performing odd-even switching control on the whole screen dual redundant light group;
If the first redundant lamp strip in the dual redundant lamp group fails, performing odd-even switching control on the first redundant lamp strip in the adjacent dual redundant lamp group;
Or if the second redundant lamp strip in the dual redundant lamp group fails, performing odd-even switching control on the second redundant lamp strip in the adjacent dual redundant lamp group.
the invention has the advantages that the invention adopts the power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; and the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit to control and drive the dual redundant lamp sets in a matching way. When the dual redundant lamp set fails, backup and fault detection of redundant lamp strips can be realized, the fault lamp strips can be automatically switched to the backup lamp strips, and backlight can still be driven to keep liquid crystal display under the condition that half of the limit lamp strips are allowed to be damaged. The invention solves the problems of low reliability and short service life of the liquid crystal screen in the prior art, and further realizes high reliability and long service life of the liquid crystal screen.
Drawings
fig. 1 is a schematic structural diagram of a redundant light bar driving circuit according to an embodiment of the present invention;
Fig. 2 is a schematic flow chart illustrating a driving method of a redundant light bar according to an embodiment of the present invention.
Wherein, 1, a back light drive controller; 2. a power supply conversion circuit; 3. a first redundant light bar; 4. a second redundant light bar; 5. a dual redundant lamp set; 6. a light bar switch switching circuit; 7. a current return circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a redundant light bar driving circuit according to an embodiment of the present invention; this redundant lamp strip drive circuit includes: a power supply conversion circuit 2; a backlight drive controller 1; a light bar switch switching circuit 6; a current return circuit 7; the dual redundant lamp set 5 is respectively connected with the power supply conversion circuit 2, the lamp strip switch switching circuit 6 and the current return circuit 7, and the dual redundant lamp set 5 can control switching; the power conversion circuit 2 is respectively connected with the backlight drive controller 1, the light bar switch switching circuit 6 and the current return circuit 7, and the light bar switch switching circuit 6 and the current return circuit 7 are respectively connected with the backlight drive controller 1.
further, the back light drive controller 1 is an ARM processor; the power conversion circuit 2 includes: a DCDC converter; the light bar SWITCH switching circuit 6 comprises a SWITCH I; the current return circuit 7 includes a SWITCH two.
Further, the dual redundant lamp set 5 includes: a first redundant light bar 3 and a second redundant light bar 4; the positive electrode of the first redundant light bar 3 is connected with the power conversion circuit 2, and the negative electrode of the first redundant light bar 3 is connected with the light bar switch switching circuit 6; the positive pole of the second redundant light bar 4 is arranged on a connecting line between the positive pole of the first redundant light bar 3 and the power conversion circuit 2, and the negative pole of the second redundant light bar 4 is connected with the current return circuit 7.
further, the power conversion circuit 2 is connected with the backlight drive controller 1 through a lamp set drive current signal. The light bar switch switching circuit 6 is connected with the backlight drive controller 1 through a first light bar enabling signal and a first test current signal, and the first light bar enabling signal and the first test current signal correspond to the first redundant light bar 3. The current feedback circuit 7 is connected with the backlight drive controller 1 through a second light bar enabling signal and a second return current signal, and the second light bar enabling signal and the second return current signal correspond to the second redundant light bar 4.
the dual redundant lamp set 5 can be a dual redundant LED lamp set, the first redundant lamp strip 3 can be a first redundant LED lamp strip, the first redundant LED lamp strip comprises a first LED lamp, the second redundant lamp strip 4 can be a second redundant LED lamp strip, and the second redundant LED lamp strip comprises a second LED lamp.
The ARM processor comprises: the pin LED-DIM is used for outputting a backlight driving constant current signal; the pin GND is used for grounding; the pin LED-EN1 is used for outputting a first light bar enabling signal; a pin LED-IFB1 for receiving a first return current signal; the pin LED-EN2 is used for outputting a second light bar enabling signal; pin LED-IFB2 for receiving a second return current signal. And the ARM processor is provided with a functional module for controlling the corresponding function of each pin.
The DCDC converter includes: the pin VIN is used for being connected with a power supply; the pin GND is used for grounding; the pin DIM is used for receiving a backlight driving constant current signal transmitted by the pin LED-DIM; the pin VLED + is used for outputting a backlight driving constant current signal to control the dual redundant lamp set 5, and specifically, is used for connecting the positive electrode of the first redundant lamp strip 3 and the positive electrode of the second redundant lamp strip 4; pin VLED "for connecting SWITCH one and SWITCH two, respectively. The DCDC converters are provided with functional modules for controlling the corresponding functions of the pins.
The SWITCH includes: the pin GND is used for grounding; the pin LED-EN is used for receiving a first light bar enabling signal output by the pin LED-EN1 in the ARM processor; the pin I-LED is used for outputting a first test current signal of the first redundant light bar 3 to a pin LED-IFB1 in the ARM processor; pin VLED + is used for connecting pin VLED-in the DCDC converter to form a loop; and the pin LED-K-is used for connecting the negative electrode of the first redundant lamp bar 3 to form a loop.
the SWITCH b includes: the pin GND is used for grounding; the pin LED-EN is used for receiving a second light bar enabling signal output by the pin LED-EN2 in the ARM processor; the pin I-LED is used for outputting a second return current signal of the second redundant light bar 4 to a pin LED-IFB2 in the ARM processor; pin VLED + is used for connecting pin VLED-in the DCDC converter to form a loop; and the pin LED-K-is used for connecting the negative electrode of the second redundant lamp bar 4 to form a loop.
In the embodiment of the invention, the invention adopts a power supply conversion circuit 2; a backlight drive controller 1; a light bar switch switching circuit 6; a current return circuit 7; and the dual redundant lamp set 5 is respectively connected with the power conversion circuit 2, the lamp strip switch switching circuit 6 and the current return circuit 7 and is matched with the power conversion circuit to control and drive the dual redundant lamp set 5. When the dual redundant lamp set 5 breaks down, the backup of redundant lamp strips and the fault detection can be realized, the fault lamp strips can be automatically switched to the backup lamp strips, and the backlight can be still driven to keep the liquid crystal display under the condition that the limit half of the lamp strips are damaged. The invention solves the problems of low reliability and short service life of the liquid crystal screen in the prior art, and further realizes high reliability and long service life of the liquid crystal screen.
as shown in fig. 2, fig. 2 is a schematic flow chart of a redundant light bar driving method according to an embodiment of the present invention, which is used in the redundant light bar driving circuit according to the embodiment, and the redundant light bar driving method includes the following steps:
and S101, when the power supply signal is detected, adjusting the constant current value of the backlight drive and outputting the constant current value to the power supply conversion circuit.
s102, turning on each group of dual redundant lamp groups according to a backlight driving constant current value and an enabling signal; the enable signal corresponds to the dual redundant light bank, and the enable signal includes a first light bar enable signal for controlling the first redundant light bar and a second light bar enable signal for controlling the second redundant light bar.
And S103, detecting the current value of each group of dual redundant lamp groups.
And S104, judging whether the dual redundant lamp group 5 has a fault according to the dual redundant lamp group current value and the backlight driving constant current value.
and S105, if the fault exists, switching control is carried out on the dual redundant lamp group.
Specifically, the volt-ampere characteristic of the LED is a positive coefficient, that is, the voltage drop of the LED increases with the increase of the current, and the redundant light bars in the invention adopt dual redundancy, so that under the condition that the total backlight driving current of the power conversion circuit is not changed, the first redundant light bar and the second redundant light bar 2 are driven to be lighted at the same time, the brightness is basically consistent with the brightness when a single light bar is lighted, but the current of each redundant light bar is halved, the voltage drop of the redundant light bars is smaller, and almost 80% of the power of the LED lights in the redundant light bars is heated, so that after the voltage is reduced, the direct effect is that the heat productivity is effectively reduced, and the temperature rise is smaller; the service life of the LED lamp is inversely proportional to the temperature, and because all the LEDs are lighted simultaneously, the thermal resistance is smaller, the heat dissipation is better, and the total temperature rise is smaller. The service life of the LED is improved by about 2 times when the junction temperature of the LED is reduced by 10 ℃ according to industry rough estimation data; and because the dual redundant lamp groups are adopted, the redundant lamp strips are doubled, and the quantity of the LED lamp beads is doubled, the total service life can be prolonged by more than 2 times theoretically.
Further, the total LED backlight driving current of the power supply conversion circuit is controlled by an LED-DIM signal (backlight driving constant current signal) in the back ARM processor, and the power current output of the power supply conversion circuit is output by VLED + and returned by VLED-. The sum of the first return current and the second return current measured by the loop currents of the first redundant light bar and the second redundant light bar is equal to the total output current of the power supply conversion circuit, namely the sum of the first return current value and the second return current value is equal to the backlight driving constant current value of the power supply conversion circuit. Because the lamp strips adopt the completely same lamp bead welding method and are positioned at adjacent positions, when the LED backlight module normally works, the first return current value and the second return current value are almost the same, and the failure mode of the highlight LED is an open circuit, so that whether the lamp strips have failure faults or not can be judged through the first return current value, the second return current value or the absolute value and the relative value, and when the lamp strips have the faults, the backlight drive controller can perform redundant switching on the first redundant lamp strips and the second redundant lamp strips through the first lamp strip enabling signals and the second lamp strip enabling signals.
Because the liquid crystal screen generally adopts dozens of redundant light bars, in order to realize the longest service life and the highest redundancy, the optimal switching logic must exist. All the lamp strips are driven to light under normal conditions, and the lighting effect is uniform, the heating is minimum and the service life is longest at the moment; when a single lamp strip fails, namely a lamp group fails, odd-even switching of the whole screen of the lamp group is carried out (for example, if a lamp group in an odd group fails, all the odd group of the lamp groups are closed, and the even group of the lamp groups are opened), and at the moment, the screen brightness still has perfect consistency; when a certain lamp strip in the lamp group breaks down, the odd-even lamp strips of the adjacent groups are switched, and due to the fact that special design is carried out on lamp bead arrangement, the screen brightness difference is very small at the moment, obvious difference does not exist, at most, half of the lamp strips of the whole screen break down at the moment, basic normal display can still be kept, and the maximum redundancy is achieved at the moment.
the invention adopts a group of power driving power supplies to simultaneously drive two light bars in the redundant light group, so that the whole circuit design is the same as that of a non-redundant driving circuit, only the current detection circuit and the number of the light bars are increased, the redundant function can be realized with the lowest cost and the panel surface, and the whole screen or single group of light bars can be switched when the lamp beads of the first redundant light bar and the second redundant light bar are simultaneously lightened and have faults at ordinary times, so that the whole screen or single group of light bars can still normally work under the condition that half of the light bars are damaged as far as possible.
Because the constant current drive power supply of the redundant lamp strip adopts the same group, even if the redundant detection circuit is switched by mistake, the drive current of the constant current drive power supply is a constant value, the situations of electric overstress overload and the like of circuit devices can not be caused, the circuit is still safe and can not be damaged, and therefore the redundant lamp strip has high safety and reliability.
In the aspect of the service life of the LED, because the scheme that the LED lamp strips are all simultaneously lightened at ordinary times is adopted, the current of each lamp bead is halved, so that the LED lamp beads have lower tube voltage drop and heat productivity, the light attenuation is smaller, the service life is longer, and the purpose of prolonging the service life is realized.
The invention adopts a basic control strategy of prolonging the service life by reducing the junction temperature of the LED, and also adopts a dual redundant driving and detecting circuit, so that the lamp bar can still normally work when the lamp bar fails, the effective service life of the outdoor display can be greatly prolonged, the outdoor display has good self-repairing characteristic, and the outdoor display can generate larger economic value.
Further, S103 includes:
And detecting a first return current signal of the first redundant lamp bar and converting the first return current signal into a first return current value.
and detecting a second return current signal of the second redundant lamp bar and converting the second return current signal into a second return current value.
under normal conditions, the first return current value is the same as the second return current value, and the sum of the first return current value and the second return current value is equal to the backlight driving constant current value.
Further, S104 includes:
And summing the first return current value and the second return current value.
If the sum of the first and second return current values is not equal to the backlight driving constant current value, it is determined that the dual redundant lamp set 5 has a fault.
furthermore, if the sum of the first and second return current values is not equal to the backlight driving constant current value, the step of determining that the dual redundant lamp set 5 has a fault includes:
a preset current value is preset, under the normal condition, the preset current value of the first return current value is equal to the preset current value of the second return current value, and the sum of the preset current value of the first return current value and the preset current value of the second return current value is equal to the backlight driving constant current value.
If the first return current value is lower than the preset current value and the second return current value is lower than the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the first redundant lamp strip and the second redundant lamp strip in the dual redundant lamp set are judged to be in failure.
If the first return current value is lower than the preset current value and the second return current value is equal to the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the first redundant lamp bar in the dual redundant lamp set is judged to be in fault.
or if the first return current value is equal to the preset current value and the second return current value is lower than the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the second redundant lamp bar in the dual redundant lamp set is judged to be in fault.
Further, if there is a fault, the step of performing switching control on the dual redundant lamp set comprises:
And if the first redundant lamp strip and the second redundant lamp strip in the dual redundant lamp group both fail, performing odd-even switching control on the whole screen dual redundant lamp group.
and if the first redundant lamp strip in the double redundant lamp groups fails, performing odd-even switching control on the first redundant lamp strip in the adjacent double redundant lamp groups.
or if the second redundant lamp strip in the dual redundant lamp group fails, performing odd-even switching control on the second redundant lamp strip in the adjacent dual redundant lamp group.
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A redundant light bar driving circuit, comprising: a power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit, and can control switching; the power conversion circuit is respectively connected with the backlight drive controller, the light bar switch switching circuit and the current return circuit, and the light bar switch switching circuit and the current return circuit are respectively connected with the backlight drive controller.
2. The redundant light bar driving circuit of claim 1, wherein the dual redundant light bank comprises: a first redundant light bar and a second redundant light bar; the positive electrode of the first redundant light bar is connected with a power conversion circuit, and the negative electrode of the first redundant light bar is connected with the light bar switch switching circuit; the second redundant lamp bar anode is arranged on a connecting line between the first redundant lamp bar anode and the power conversion circuit, and the second redundant lamp bar cathode is connected with the current return circuit.
3. the redundant light bar driver circuit of claim 2, wherein the power conversion circuit is connected to the backlight driver controller via a light bank drive current signal;
The light bar switch switching circuit is connected with the backlight drive controller through a first light bar enabling signal and a first testing current signal, and the first light bar enabling signal and the first testing current signal correspond to the first redundant light bar;
The current return test circuit is connected with the backlight drive controller through a second lamp bar enabling signal and a second return test current signal, and the second lamp bar enabling signal and the second return test current signal correspond to the second redundant lamp bar.
4. The redundant light bar drive circuit of claim 1, wherein the backlight drive controller is an ARM processor.
5. the redundant light bar driving circuit of claim 1, wherein the power conversion circuit comprises: a DCDC converter.
6. A redundant light bar driving method used in the redundant light bar driving circuit of any one of claims 1 to 5, comprising the steps of:
When a power supply signal is detected, adjusting the backlight driving constant current value and outputting the constant current value to the power supply conversion circuit;
opening each group of dual redundant lamp groups according to the backlight driving constant current value and an enabling signal; the enabling signal corresponds to the dual redundant light group, and comprises a first light bar enabling signal for controlling a first redundant light bar and a second light bar enabling signal for controlling a second redundant light bar;
detecting the current value of each group of dual redundant lamp groups;
judging whether the dual redundant lamp set has a fault according to the current value of the dual redundant lamp set and the backlight driving constant current value;
and if the fault exists, switching control is carried out on the dual redundant lamp group.
7. The method of claim 6, wherein the step of detecting the current value of each dual redundant set of lights comprises:
Detecting a first return current signal of the first redundant lamp bar and converting the first return current signal into a first return current value;
Detecting a second return current signal of the second redundant lamp bar and converting the second return current signal into a second return current value;
Under normal conditions, the first return current value is the same as the second return current value, and the sum of the first return current value and the second return current value is equal to the backlight driving constant current value.
8. The method of claim 7, wherein the step of determining whether the dual redundant lamp set is faulty according to the dual redundant lamp set current value and the backlight driving constant current value comprises:
Summing the first measured return current value and the second measured return current value;
And if the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, judging that the dual redundant lamp set has a fault.
9. The method of claim 8, wherein the step of determining that the dual redundant lamp set is faulty if the sum of the first and second return current values is not equal to the backlight-driven constant current value comprises:
Presetting a preset current value, wherein under the normal condition, the preset current value of the first return current value is equal to the preset current value of the second return current value, and the sum of the preset current value of the first return current value and the preset current value of the second return current value is equal to the backlight driving constant current value;
if the first return current value is lower than the preset current value and the second return current value is lower than the preset current value, judging that the first redundant lamp strip and the second redundant lamp strip in the dual redundant lamp set both have faults if the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value;
If the first return current value is lower than the preset current value and the second return current value is equal to the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the first redundant lamp strip in the dual redundant lamp set is judged to be in fault;
or if the first return current value is equal to the preset current value and the second return current value is lower than the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the second redundant lamp bar in the dual redundant lamp set is judged to be in fault.
10. the method of claim 1, wherein the step of controlling the dual redundant light bank to switch if there is a fault comprises:
If the first redundant light bar and the second redundant light bar in the dual redundant light group both fail, performing odd-even switching control on the whole screen dual redundant light group;
if the first redundant lamp strip in the dual redundant lamp group fails, performing odd-even switching control on the first redundant lamp strip in the adjacent dual redundant lamp group;
Or if the second redundant lamp strip in the dual redundant lamp group fails, performing odd-even switching control on the second redundant lamp strip in the adjacent dual redundant lamp group.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111063310A (en) * | 2020-01-07 | 2020-04-24 | 业成科技（成都）有限公司 | Display and brightness adjusting method thereof |
| CN114863883A (en) * | 2021-01-20 | 2022-08-05 | 纬创资通股份有限公司 | Direct type backlight light-emitting diode display and light-emitting control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111063310A (en) * | 2020-01-07 | 2020-04-24 | 业成科技（成都）有限公司 | Display and brightness adjusting method thereof |
| CN114863883A (en) * | 2021-01-20 | 2022-08-05 | 纬创资通股份有限公司 | Direct type backlight light-emitting diode display and light-emitting control method |
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